CBSE > Class 09 > Mathematics | CBSE Board | Homework Help

In geometry, Heron's formula (sometimes called Hero's formula), named after Hero of Alexandria, gives the area of a triangle when the length of all three sides are known. Unlike other triangle area formulae, there is no need to calculate angles or other distances in the triangle first.

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Abcd is a cycli quadrlateral whose diagonals intersect at point E.if angle dbc =70 angle bac =30 find angle bcd .further if ab =bc,find angle ecd

Posted by Roja Gowda 5 years, 7 months ago

CBSE > Class 09 > Mathematics

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In chapter Heron's formula do we have to find the square root upto 3 decimal places or 2 decimal places?

Posted by Niharika Gureja 5 years, 7 months ago

CBSE > Class 09 > Mathematics

2 answers

Ash Ketchum 5 years, 7 months ago

You can leave the answer either in root or sometimes if i want to know complete exact answer then i need to solve root to 5-6 decimals by calculators..so it can vary....

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Vashu Tyagi 5 years, 7 months ago

1.73

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How to draw a triangle of angle 50 60 70

Posted by Ikram Malikgc 5 years, 7 months ago

CBSE > Class 09 > Mathematics

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How many sides are in heptacetagon

Posted by Aman Kumar 5 years, 7 months ago

CBSE > Class 09 > Mathematics

1 answers

Girish Karhana 5 years, 7 months ago

In geometry, a hectogon or hecatontagon or 100-gon is a hundred-sided polygon.

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The sum of the probability of all staff events of a trial is

Posted by Vedanta Kachhawa 5 years, 7 months ago

CBSE > Class 09 > Mathematics

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What is the formula of rectangle of a perimeter, area and volume this is class 5 th question you have 10 min to answer this question

Posted by Varun Singh 5 years, 7 months ago

CBSE > Class 09 > Mathematics

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How is actresses found

Posted by Varun Singh 5 years, 7 months ago

CBSE > Class 09 > Mathematics

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What is a non colliner

Posted by Paplu Boro 5 years, 7 months ago

CBSE > Class 09 > Mathematics

1 answers

Anurag Choudhary 5 years, 7 months ago

Three or more points which are in a line is called non collinear points

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pqrs is a trapezium with PQ parallel to SR and PS equal to QR prove that the trapezium is cyclic

Posted by Akib Knox 5 years, 7 months ago

CBSE > Class 09 > Mathematics

2 answers

Gaurav Rana 5 years, 7 months ago

Construction =draw pn perpendicular sr and qm perpendicular sr Proof =In triangle psn and triangle qmr PS =QR (given) Angle PNS =Angle QMR ( each 90°) PN= QM(perpendicular distance between two ll lines always equal) Triangle PSN =~(means congurent to) triangle QMR ( by RHS ) Angle SPN =Angle RQM(by CPCT) Adding 90° both sides Angle P= Angle Q Angle S +Angle P=180°( by co- interior) Angle S+Angle Q=180°( angle P = Angle Q) Angle R +Angle Q =180°(by co -interior ) Angle R+Angle P =180°(Angle P=Angle Q) Since sum of the opposite angle of the trapezium is 180° hence it is a cyclic trapezium

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Gaurav Rana 5 years, 7 months ago

Given=PQRS is a trapezium in which PS =QR and PQ ||SR To prove = angle p+ angle R = 180°and angle S + angle Q=180°

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Chapter 9 excrcise 9.2 q3

Posted by Anand Kishor 5 years, 7 months ago

CBSE > Class 09 > Mathematics

1 answers

Girish Karhana 5 years, 7 months ago

Proof = ΔAPB and //gm ABCD are on same base AB and b/w same parllels AB and DC. So,area(ΔAPB)=1/2 area (//gm ABCD) -1 ΔBQC of //gm ABCD have same base BC and b/w same parllels BC and AD So,area(ΔBQC)=1/2 area (//gm ABCD) -2 From eq. 1 and 2 area(ΔAPB)=area(ΔBQC) Hence Proved

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A:B=5:6 and b:c=9:10 a:b:c=?

Posted by Vinod Kumar 5 years, 7 months ago

CBSE > Class 09 > Mathematics

1 answers

Anurag Choudhary 5 years, 7 months ago

15:18:20

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Decimal expension of a rational number is terminating

Posted by Nikhat Parveen 5 years, 7 months ago

CBSE > Class 09 > Mathematics

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Proof mid point theorem and converse of mid point theorem

Posted by Rajesh Kumar 5 years, 7 months ago

CBSE > Class 09 > Mathematics

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€&_8

Posted by Vashu Tyagi 5 years, 7 months ago

CBSE > Class 09 > Mathematics

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Girish Karhana 5 years, 7 months ago

632.48 Indian rupee 8 Euro

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ABCD is s rhombus. EABF is a straight line such that EA=AB=BF. Prove that ED and FC ,when produced ,meet at right angles.

Posted by Ramesh Tiwari 5 years, 7 months ago

CBSE > Class 09 > Mathematics

1 answers

Gaurav Seth 5 years, 7 months ago

SinceΔEAD=ΔABC
(Corresponding angles),&AD=BC(sides of the rhombus)
By side angle side congrugency,the triangles
Therefore the corresponding parts of the triangle are also equal.
ΔCBF & ΔDAB
Since the sides
BF=AB
∠CBF∠DAB(corresponding angles)
ΔCBF&ΔDAB are congrugent
ΔAOB
∠ABO+∠BAO+∠AOB=180°
∠ABO+∠BAO=90°
∠CFB+∠AED=90°
∠XFE+∠XEF=90°

Read more on Brainly.in - https://brainly.in/question/987606#readmore

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3rd route of 24 divided by (4th root of 2 multiplied by 3rd root of 3

Posted by Krishna Hegde 5 years, 7 months ago

CBSE > Class 09 > Mathematics

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The solution of the equation √5x - 4 = 2√5 + 6 is --------------

Posted by Vedika Šäbłè 5 years, 7 months ago

CBSE > Class 09 > Mathematics

2 answers

Shivam Raj 5 years, 7 months ago

√5x-4=2√5+6 √5x=2√5+6+4 √5x=2√5+10 x=2√5+10÷√5 x=2√5(1+√5)÷√5 x=2(1+√5) x=2+2√5

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Daniya Khatoon 5 years, 7 months ago

Yeah Kaisa saval h

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Give the equation of two lines passing through (8,9)

Posted by Vedika Šäbłè 5 years, 7 months ago

CBSE > Class 09 > Mathematics

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Chapter of 2

Posted by Pooja Mishra 5 years, 7 months ago

CBSE > Class 09 > Mathematics

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ABCD is a trapezium in which AB parallel CD.the side CD is produced both sides.if angle ADE =50 and angle A=angle B.find the value of x.

Posted by Pushkar Kharb 5 years, 7 months ago

CBSE > Class 09 > Mathematics

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The mean of 5 numbers is 30. if one number is excluded, their mean becomes 28 .find the excluded number

Posted by Anshman Modi 5 years, 7 months ago

CBSE > Class 09 > Mathematics

1 answers

Namrata Jindal 5 years, 7 months ago

Mean of 5 numbers? is 30. So sum of the numbers will be 5*30=150. If one number is excluded, Mean of 4 numbers was 28. So sum will be 4*28=112. Excluded number?=150-112=38.

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Solve √2(√2)

Posted by Dinesh Kumar 5 years, 7 months ago

CBSE > Class 09 > Mathematics

2 answers

Vedika Šäbłè 5 years, 7 months ago

√2*√2 = 2

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Yogita Ingle 5 years, 7 months ago

√2(√2) = √4 = 2

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The mean of 10 observation is 42. If each observation in the data is decreased by 12 what will be the new mean of the data?

Posted by Trupti Saike 5 years, 7 months ago

CBSE > Class 09 > Mathematics

1 answers

Gaurav Seth 5 years, 7 months ago

SHORT FORMULA
NEW MEAN =MEAN - THE COMMON NUMBER DECREASED
=40-12
=30

Detailed solution :

Mean=sum of total observation /total number of observation
42=sum of total observation /10
420=sum of total observation
Now each member of the observation is decreased 12
=12*10=120
New sum of total observation =420-120
=300
New mean =300/10
=30

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Find the volume of the right circular cone with Radius 3.5cm , height 12cm

Posted by Pritam Giri 5 years, 7 months ago

CBSE > Class 09 > Mathematics

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Shriya Samaga 5 years, 7 months ago

Volume of cone= 1/3×22/7×R²×H =1/3× 22/7×3.5×3.5×12=154cm²

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In figure PR is greater than PS bisects less than QPR.prove that angle PSRis greater thananglePSQ

Posted by Shivappa B S B 5 years, 7 months ago

CBSE > Class 09 > Mathematics

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What percentage of class nineth syllabus is included for tenth board exam ?

Posted by Indraneel Dutta 5 years, 7 months ago

CBSE > Class 09 > Mathematics

2 answers

Hariom Dalal 5 years, 7 months ago

Almost full because in 10th everything is based on its base i.e 9th & if student is weak in studies than atleast 30% which includes common questions. Actually there is a choice now for weak students they can choose computer as optional & maths(basic) for proceedings.

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Abhinav Prience 5 years, 7 months ago

At least 10 to 20 percent

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