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

Here, Given that ABC is a triangle. And ∠A = 100°, Also AB = AC. We know that if the two adjacent sides of a triangle is equal, then there opposite angles are also equal to each other. Now, ∵ AB = AC ∴ ∠B = ∠C = x (say). Now, we know that sum of all angles of a triangle is 180°, ∴ ∠A + ∠B + ∠C = 180° ; 100° + x° + x° = 180° ; 100° + 2x° = 180° ; 2x° = 180° - 100° ; 2x° = 80° ; x° = 80° ÷ 2 ; x° = 40°. Since, we know that x° = ∠B, Therefore ∠B = 40°.

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Which type of no. is √-81?

Posted by Prachi Bhardwaj 3 years, 2 months ago

CBSE > Class 09 > Mathematics

2 answers

Shubham Kumar Gupta 3 years, 2 months ago

(√-81) is a type of rational number.

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Minaj Parveen 3 years, 2 months ago

Odd no.

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2+2-2+2-2(-2+0)×37-(30)=

Posted by Ayan Khan 3 years, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Ismail Shaikh 3 years, 2 months ago

2+2+2+2+2+

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The number of dimensions, a solid has

Posted by Rasika Patil 3 years, 2 months ago

CBSE > Class 09 > Mathematics

0 answers

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Property

Posted by Jainesh Kumar 3 years, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Shubham Kumar Gupta 3 years, 2 months ago

Kiski ??? Ambani ki ya Adani ki ???

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What is 9×8=3?

Posted by Armaan Singh 3 years, 2 months ago

CBSE > Class 09 > Mathematics

4 answers

Shubham Kumar Gupta 3 years, 2 months ago

What is 9 × 8 = 3 × _ ? Let the blank area be x. Now, 9 × 8 = 3 × x ; 72 = 3x ; x = 72 ÷ 3 ; x = 24. Therefore, 9 × 8 = 3 × 24.

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Ayush Kumar 3 years, 2 months ago

Uhu

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Ayan Khan 3 years, 2 months ago

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Armaan Singh 3 years, 2 months ago

56$3

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In figure BA parallel to Ed and DC parallel to EF show that ABC equal to dgf hint produce due to intersect bcrp say

Posted by Gods Star 3 years, 2 months ago

CBSE > Class 09 > Mathematics

0 answers

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Posted by Jyoti Kumari Jyoti Kumari 3 years, 2 months ago

CBSE > Class 09 > Mathematics

0 answers

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If a triangle is equilateral and have two sides length are (5×2)cm and (7×4)cm. Find the value of the third side of the triangle

Posted by Angel Ghusinga 3 years, 2 months ago

CBSE > Class 09 > Mathematics

2 answers

Subham Saha 3 years, 2 months ago

5_2=

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Lawkik Gadiya 3 years, 2 months ago

Maa ka bhosada

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What we have to do for ias officer

Posted by Atharva Avhad 3 years, 2 months ago

CBSE > Class 09 > Mathematics

5 answers

Atharva Avhad 3 years, 2 months ago

Which degree I have to take

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Sylwia Prakash 3 years, 2 months ago

You have to improve your g.k and social studies your talking skills your English

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R Mithun 3 years, 2 months ago

Perfect

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Atharva Avhad 3 years, 2 months ago

Thanks

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Angel Ghusinga 3 years, 2 months ago

Keeping exercise, improve your running skills and strong your will power

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The area of a right -angled triangle is 20m square and one of the sides containing the right triangle is 4 cm then the altitude on the hypotenuse is

Posted by Bharati Pradhan 3 years, 2 months ago

CBSE > Class 09 > Mathematics

0 answers

ANSWER

How to make a plotpolio

Posted by Usha 👩‍🎓 3 years, 2 months ago

CBSE > Class 09 > Mathematics

1 answers

Aaditya Kumar 3 years, 2 months ago

Write my protpholio class 9 th on YouTube

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Find the value of x if x=23 x+1/5

Posted by Siddhi Gupta 3 years, 2 months ago

CBSE > Class 09 > Mathematics

3 answers

Shubham Kumar Gupta 3 years, 2 months ago

Find the value of x, if x = 23x + ⅕. x = 23x + ⅕ ; x - 23x = ⅕ ; -22x = ⅕ ; x = ⅕ × -22 ; x = -22/5 .

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Shubham Kumar Gupta 3 years, 2 months ago

Find the value of x, if x = 23x + ⅕ x = 23x + ⅕ x - 23x = ⅕ -22x = ⅕ x = ⅕ × -22 x = -22/5

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Garima Saini 3 years, 2 months ago

If x= 23x +1/5 x - 23x = 1/5 -22x = 1/5 x = 1/5 × -22 Therefore : x = -1/110 (answer)

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If the angles of a triangle are in the ratio 1:2:3 , find the three angles

Posted by M Reshma 3 years, 2 months ago

CBSE > Class 09 > Mathematics

2 answers

Shubham Kumar Gupta 3 years, 2 months ago

If the angles of a triangle are in the ratio of 1:2:3 , find the value of all the angles of the triangle. Let the angles of the triangle be 1x°, 2x° and 3x°. We know that sum of all angles of a triangle is 180°. So, 1x° + 2x° + 3x° = 180°. 6x° = 180°. x° = 180°/6 = 30°. Hence, Angles of the triangle (i) 1x° = 1 × 30° = 30° (ii) 2x° = 2 × 30° = 60° (iii) 3x° = 3 × 30° = 90°.

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Ayushi Shekhawat 3 years, 2 months ago

Sum of all angles of a triangle=180 degree Angles= 1x+2x+3x =180 =6x =180 =x=180/6 =x = 30 All three angles = 30×1 =30 = 30×2 =60 = 30×3=90

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If 1800=2^a×3^b×4^c, then find the value of a+b+c=?

Posted by Angel Ghusinga 3 years, 2 months ago

CBSE > Class 09 > Mathematics