Question

In ABC, the interior angle at A is 51°and the exterior angle at B is 119º. The interior angle at C measures
A 51°
B 68°
C 90°
D 39°

Answer 1

Interior angle at C measures
68

Answer 2

Answer:

using property,

Exterior angle = sum of two interior corresponding angles of a triangle

119⁰=51⁰ + interior angle at C

so, interior angle at C = 119⁰ - 51⁰

= 68⁰

option (B) is correct.