Answer:

Explanation:
An equilateral triangle has 3 equal sides and angles. 
A right triangle contains one right or 90 degree angle. 
An isosceles triangle has 2 equal sides and base angles. 
A scalene triangle has no equal sides or angles. 
The triangle given has the sides of 5 cm, 5 cm, and 7 cm. 
Therefore, 2 of the sides are equal and this must be an isosceles triangle.