Question

In a right angled ABC, AB is a perpendicular to BC and angle C =50 Find the third angle

Answer 1

In triangle ABC
<A+<B+<C=180°
<A+90°+50°=180°
<A=180°-140°
<A=40°

Answer 2

as AB PERPENDICULAR TO BC
THEREFORE
angle ABC=90
AND angle ACB=50 as said
so
angle CAB=180-(90+50)
                   180-140
                    40
ANS