Question

Find the values for a, b and c.

Answer 1

21°, 42°, 117°

Explanation:

arc represents the central angle, so angle at the circumference is the half of central angle

• b=84°/2= 42°
• a=42°/2= 21°
• a+b=180°-c ⇒ c= 180°- (42°+21°)= 180°- 63°= 117°