Question

http://media.education2020.com/evresources/2092266_d1b0d6a3-9119-4e8a-8389-99f582de04b1.png


The triangle above is changed so that the exterior angle shown measures 128 degrees. How does this affect angles B and C?

Answer 1

Medl and F4f

Answer 2

Initially, <CAB measured 28 but it has increased by24 so now it measures52

let<B be x
<C=x-28
so
(x)+(x-28)=(180-52)
2x-28=128
2x=156
x=78
so
<B= 78
<C=78-28=50

Answer 3

therefore, <B will decres by (90-78)
and <C will decrease by (62-50)