Question

9) In ∆ABC, <A: <B: <C = 2:3:5, then angle at B is
a) 54°
b) 126°
c) 136°
d) 64⁰​

Answer 1

Step-by-step explanation:

Let the <A, <B, <C be 2x, 3x and 5x respectively,

ATQ

2x+3x+5x= 180[sum of all interior angles of a

triangle is 180°]

10x= 180°

x= 180/10

x= 18

<A = 18× 2

= 36°

<B = 18× 3

= 54°

<C = 18×5

= 90°

Therefore <B is equals to 54°(Ans)