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

As both angles are supplementary so, => (40-a)° +(120-2a)°= 180° => 40-a + 120 -2a = 180 => 160 - 3a = 180 => -3a = 180-160 => -3a = 20 Or 3a = -20 So, a = -20/3 = - 6.6666....

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Two angles measure (40-a) and (120-2a).If both the angles are supplementary of one other ,find the value of

Posted by Aditya Chhetri 7 years, 10 months ago

CBSE > Class 09 > Mathematics

0 answers

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Two angles measure (40-a) and (120+2a).If both the angles are supplementary of one other,

Posted by Aditya Chhetri 7 years, 10 months ago

CBSE > Class 09 > Mathematics

0 answers

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The mean of five numbers is 30. If one is excluded their mean become 28. What is the excluded number

Posted by Abhishek Chhetri 7 years, 10 months ago

CBSE > Class 09 > Mathematics

1 answers

Khushi Singh 7 years, 10 months ago

Excluded no. Is 10

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a friendly match is organized between 2 teams. The profit of the match will be given for the aid to the Charitable Hospital for handicapped children. The field is circular with a ring of uniform width as shown in figure for spectators. If O is the centre of the field and four poles are fixed at points A,B,C and D lying in a straight line. Prove that AB=CD= 1/2 (AD-BC). Which value is promoted through this question?

Posted by Fahim Fa 7 years, 10 months ago

CBSE > Class 09 > Mathematics

1 answers

Fahim Fa 7 years, 10 months ago

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Write the rationalizing factor far 6\12-3

Posted by Prince Bhundiya 7 years, 10 months ago

CBSE > Class 09 > Mathematics

1 answers

Priyanshu Bansal 7 years, 10 months ago

12+3

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To prove that area of triangle =1/2×base×height

Posted by Sukhman Jit Kaur 7 years, 10 months ago

CBSE > Class 09 > Mathematics

1 answers

Nithin Goud 7 years, 10 months ago

If u observe a parallelogram a diagonal divides it into 2 congruent triangles of equal area.So area of 1 triangle is half of parallelogram.So area of triangle=1/2b×h. We have another proof also but it is too big and requires a diagram. I think this is enough.

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construct a triangle PQR given that QR = 3cm , angle PQR = 45 degree and QP -PR = 2cm

Posted by Ishant Aggarwal 7 years, 10 months ago

CBSE > Class 09 > Mathematics

1 answers

Rockers Rock 7 years, 10 months ago

its easy

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1×1

Posted by Sushant Chaudhari 7 years, 10 months ago

CBSE > Class 09 > Mathematics

5 answers

Nithin Goud 7 years, 10 months ago

5/5

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Manisha Bhardwaj 7 years, 10 months ago

hiii

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Shrish Kashyap 7 years, 10 months ago

hii abhayy

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Shrish Kashyap 7 years, 10 months ago

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The Frost Sword 7 years, 10 months ago

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If two opposite angles of a parallelogram are (63-3x) and (4x-7)°.Find all the angles of the parallelogram

Posted by Ritika Niranjan 7 years, 10 months ago

CBSE > Class 09 > Mathematics

2 answers

Smaran Diwate 7 years, 10 months ago

Hi ritika

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Smaran Diwate 7 years, 10 months ago

As opposite angles of a triangle are equal . Therefore 63-3x = 4x-7 .So the angles are 105 ,75,105,75

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A coin is tossed 40 times and head appears 15 times. Find the probability of getting a tail.

Posted by Bharti Rao 7 years, 10 months ago

CBSE > Class 09 > Mathematics

4 answers

Shivam .G 7 years, 10 months ago

25/40

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Azim Kheradiya 7 years, 10 months ago

5/8

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Mantavya Prasar 7 years, 10 months ago

No. Of Heads = 15 Total times coin tossed = 40 No. Of Tails = Total times coin tossed - No. Of Heads =40 - 15 = 25 Probability of getting a tail = No.Of Tails/No.Times Of coin tossed = 25/40 = 5/8 I hope that it helped you

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B Gd 7 years, 10 months ago

⅝

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Constuct triangle ABC in which Angle B 30 angke c 90 and ab + bc+ ca=11 cm

Posted by Mridul Sharma 7 years, 10 months ago

CBSE > Class 09 > Mathematics