Practice30 Create account

A triangular signboard has angles $(x)$ deg $, (x)$ deg and $(x + 60)$ deg.
The two equal angles are the base angles.
Find the measure of each base angle.

Class 7Angle Sum PropertyTriangles

A44
B40
C80
D36

Step-by-Step Solution

x + x + (x + 60) = 180

, so

3 x + 60 = 180, 3 x = 120, x = 40

. Each base angle = 40°.

Answer: B) 40

Master this chapter in 30 minutes a day.

Don't just memorise the answer — build a daily practice habit.

Practice 5 Similar Questions Free →

All Angle Sum Property practice questions

More Class 7 Angle Sum Property practice

A surveyor finds that in a triangular field, the difference between the largest and…How many triangles are there whose three angles are all whole numbers of degrees, each a…What is the sum of the three interior angles of any triangle?Which set of three angles can form a triangle?In a triangle, one angle is 110°. What can be said about the triangle?