Question

In triangle ABC find the angles B, C if angle A is 40 degrees and also find the exterior which is marked 3x​

Answer 1

Step-by-step explanation:

a=40 degrees

let b be 'x'.

also exterior angle is 3x

then, 40+x=3x

2x=40

x=20

then angle b =x=20 degrees

A+B+C=180 DEGREES

40+20+C=180

60+C=180

C=180-60

C=120

So,3x=3*20=60 degrees

so angle b=20 degrees

angle c =120 degrees

exterior angle=60 degrees