If two angles of a triangle are 60° each, then the triangle is
A. Isosceles but not equilateral

B. Scalene

C. Equilateral

D. Right-angled

If two angles of a triangle are 60° each, then the triangle is

In an isosceles triangle, one angle is 70°. The other two angles are of

(i) 55° and 55°

(ii) 70° and 40°

(iii) any measure

In the given option(s) which of the above statement(s) are true?

In ∆PQR, if PQ = QR and ∠Q = 100°, then ∠R is equal to

In ∆PQR of Fig. 6.32, PQ = PR. Find the measures of ∠Q and ∠R.

The lengths of two sides of an isosceles triangle are 9 cm and 20 cm. What is the perimeter of the triangle? Give reason.

If D is the mid-point of the side BC in Δ ABC where AB = AC, then ∠ADC is

Is it possible to have a triangle with the following sides?

(i) 2 cm, 3 cm, 5 cm

(ii) 3 cm, 6 cm, 7 cm

(iii) 6 cm, 3 cm, 2 cm

Each of the two equal angles of an isosceles triangle is four times the third angle. Find the angles of the triangle.

In Fig. 6.45, if ST = SU, then find the values of x and y.

In Fig. 6.44, if RP = RQ, find the value of x.