In Fig. 6.11, the value of

∠A + ∠B + ∠C + ∠D + ∠E + ∠F is


A. 190°

B. 540°

C. 360°

D. 180°

In a right-angled triangle, the angles other than the right angle are

In Fig. 6.34, find the measures of ∠PON and ∠NPO.

Find the values of x and y in Fig. 6.37. Plan a Strategy

In Δ ABC, if ∠A = ∠C, and exterior angle ABX = 140°, then find the angles of the triangle.

In a triangle ABC, the measure of angle A is 40° less than the measure of angle B and 50° less than that of angle C. Find the measure of ∠A.

In Fig. 6.31(i) and (ii), find the values of a, b and c.

In Fig. 6.30, find the value of x.

The measure of three angles of a triangle are in the ratio 5 : 3 : 1. Find the measures of these angles.