Question

Value of x in the figure below:


a) 20⁰

b) 30⁰

c) 60⁰

d) 40⁰​

Answer 1

SOLUTION :-

• Use exterior angle property.

• Exterior Angle Property :- The measure of an exterior angle is equal to the sum of the measures of the two opposite interior angles of the triangle.

• Hence from the figure
• Exterior angle = 100°
• Opposite interior angles 3x , 2x

• 3x + 2x = 100
• 5x = 100
• x = 100/5
• x = 20°

Hence option a) is correct.