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a=18cm b=14cm c=10cm s=18+14+10/2=42/2=21 By Heron's Formula area of triangle =√s(s-a) (s-b) (s-c) =√21(21-18)(21-14)(21-10) =√21×3×9×11 =√7×3×3×3×3×11 =3×3√7×11 =9√77cm^2

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Suryaveer Singh Chauhan 5 years, 9 months ago

Under root 231

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The diameter of a roller is 84cm and length 120cm it 500 complete reviolation to move one cover 2 leval play ground of m.sq

Posted by Brajesh Bhadouria 5 years, 9 months ago

CBSE > Class 09 > Mathematics

2 answers

Tiger Boos 5 years, 9 months ago

T.s.a =2×22/7×42×120 =31680cm² Change = m =1584m²

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Gaurav Seth 5 years, 9 months ago

Given,
Diameter = d = 84cm
Radius = r = d/2 = 42cm
Length = l = 120 cm
T.S.A of cylinder = 2πrh
= 2 x 22/7 x 42 x 120
= 31680 cm²
Area levelled by 500 revolution = Area of playground
= 500 x 31680cm²
= 15840000 cm² [ change into m]
= 1584 m²

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An isosceles triangle has perimeter 30 cm and each of the equal sides is 6 cm. Find the area of the triangle

Posted by Pradeep Chaudhary 5 years, 9 months ago

CBSE > Class 09 > Mathematics

1 answers

Gaurav Seth 5 years, 9 months ago

Length of the equal sides = 12cm
Perimeter of the triangle = 30cm
Length of the third side = 30 - (12+12) cm = 6cm
Semi perimeter of the triangle(s) = 30/2 cm = 15cm
Using heron's formula,
Area of the triangle = √s (s-a) (s-b) (s-c)
                                       = √15(15 - 12) (15 - 12) (15 - 6)cm2
                                       = √15 × 3 × 3 × 9 cm2
                                       = 9√15 cm2

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(1+tanA+secA)(1+cotA-cosec²A)=

Posted by Rohan Rauniyar 5 years, 9 months ago

CBSE > Class 09 > Mathematics

0 answers

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Find the value of a and b 3+√2÷ 3-√2 = a + b √2

Posted by Aanchal Yadav 5 years, 9 months ago

CBSE > Class 09 > Mathematics

1 answers

Sudeep Darshan 5 years, 9 months ago

a=11/7;b=6/7

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Factorize, 9x²+6xy+y²

Posted by Md. Adil Sharif 5 years, 9 months ago

CBSE > Class 09 > Mathematics

4 answers

Sudeep Darshan 5 years, 9 months ago

9x²+6xy+y² 9x²+3xy+3xy+y² 3x(3x+y)+y(3x+y) So the factors are (3x+y)(3x+y)

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Kunal Kumawat 5 years, 9 months ago

Factorization

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Shivam Gupta 5 years, 9 months ago

9x^2+6xy+y^2 9x^2+(3+3)xy+y^2 9x^2+3xy+3xy+y^2

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Niharika Choudhary 5 years, 9 months ago

9x^2 + y^2 = -6xy

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PQRS is a rhombus with angle QPS=50° find angle RQS?

Posted by Shivam Singh 5 years, 9 months ago

CBSE > Class 09 > Mathematics

1 answers

Anurag Kumar 5 years, 9 months ago

65°

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If (a)+b=- c then find the value of (a)2+((b)2+(c)2

Posted by Chandana Patra 5 years, 9 months ago

CBSE > Class 09 > Mathematics

1 answers

Suryaveer Singh Chauhan 5 years, 9 months ago

0 because a+b+c=0

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How to find the upper limit and lower limit in statiatics

Posted by Sunju G Momin 5 years, 9 months ago

CBSE > Class 09 > Mathematics

0 answers

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Formula of area of rhombus

Posted by Aditya Kumar 5 years, 9 months ago

CBSE > Class 09 > Mathematics

1 answers

Anurag Kumar 5 years, 9 months ago

1/2×product of diagonal

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Show that are medium of a triangle divides it into two Triangles of equal area

Posted by Aniket Singh Cool 786 5 years, 9 months ago

CBSE > Class 09 > Mathematics

1 answers

Suryaveer Singh Chauhan 5 years, 9 months ago

Prove both the traingle congruent.

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Chapter 8

Posted by Shabad Saifi 5 years, 9 months ago

CBSE > Class 09 > Mathematics

0 answers

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5 प्लस अंडर रूट 72 प्लस अंडर रूट 5

Posted by Shubham Chaudhary 5 years, 9 months ago

CBSE > Class 09 > Mathematics

0 answers

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Prove that the angle subtending by an arc at the centre is double on the remaining part of the circle

Posted by Lakshay Choudhary 5 years, 9 months ago

CBSE > Class 09 > Mathematics

0 answers

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Express x in terms of y, given that x-3y =9 or not

Posted by Yash Singh Thakur 5 years, 9 months ago

CBSE > Class 09 > Mathematics

0 answers

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(x-2)^2-(x+2)^2

Posted by Rakhi Patil 5 years, 9 months ago

CBSE > Class 09 > Mathematics

0 answers

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Prove that if one angle of a isoceles triangle is equal to the summ of the other two angles ,then

Posted by Wondering Dailies 5 years, 9 months ago

CBSE > Class 09 > Mathematics

0 answers

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3x+2\7+4(x+1)\5=2\3

Posted by Sachin Roy 5 years, 9 months ago

CBSE > Class 09 > Mathematics

0 answers

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Ordinate of all the point on x- axis is

Posted by Sachin Roy 5 years, 9 months ago

CBSE > Class 09 > Mathematics

1 answers

Aryan Kothari 5 years, 9 months ago

ZERO

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Show that if the diagonal of a quadrilateral bisect each other at right angles, then it is a rhombus

Posted by Shobha Kushwaha 5 years, 9 months ago

CBSE > Class 09 > Mathematics

1 answers

Yadav Kanganheriya 5 years, 9 months ago

Yes

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Find root 5 in number line

Posted by Sugar Makeover 5 years, 9 months ago

CBSE > Class 09 > Mathematics

1 answers

Yadav Kanganheriya 5 years, 9 months ago

Yes

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Construct a right triangle who's base is 12cm and sum of its hypotenuse and other side is 18cm

Posted by Parul Jain 5 years, 9 months ago

CBSE > Class 09 > Mathematics

3 answers

Suryaveer Singh Chauhan 5 years, 9 months ago

Sorry for my wrong answer for opp. Question so sorry

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Suryaveer Singh Chauhan 5 years, 9 months ago

No. Of electron present in a outermost shell is called vallancy and if no. Of electron is less than the half of shell contain it ,so shell gain electron so vallancy is positive. Thanks

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Vashu Tyagi 5 years, 9 months ago

Let base is12cm =6cm And hypremise is 18cm=9cm

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