Question

find the measurement of the unknown sides or angles marked by small letters in the following pairs of congruent triangles​
plz help me ...

Answer 1

Answer:

In fig. 4a

angle a=80°

angle b =60°

angle c=?

a+b+c=180°

80°+60°+c=180°

140°+c=180°

c=180°-140°

c=40°

In fig. 4b

angle p=x

angle q=80°

angle r=40

p+q+r=180°

x+80°+40°=180°

x+120°=180°

x=180°-120°

x=60°

Hope it will help you!!!