Question

Two angles in a triangle are ${60}^{\circ }$ each. Then the triangle is:

• A. 1- c; 2- a; 3- b
• B. 1- c; 2- b; 3- a
• C. 1- a; 2- c; 3- b
• D. 1- a; 2- b; 3- c

Answer 1

The correct option is C

1- a; 2- c; 3- b

Given that the two of three angles in the triangle are ${60}^{\circ }$.
By angle sum property for a triangle,
Sum of three angles of a triangle is ${180}^{\circ }$
Then the third angle must be ${60}^{\circ }$
Therefore, the triangle is equilateral.