The perimeter of an isosceles triangle is 25cm, the length of each side in cm two of the sides are prime numbers , work out the lengths of the sides of the two possible isosceles triangles.

Question

Gcse calculator paper

Answer 1

An isosceles triangle has two equal sides only.

The prime numbers are 2, 3, 5, 7, 11. We don’t whether the prime sides are equal, but let’s assume that they are. So we could have 2×2+21, 2×3+19 (all 3 sides are prime), 2×5+15, 2×7+11 (all sides prime), 2×11+3 (all sides prime). These are all possible integer values (measurements in cm).

Answer 2

I need someone to tell me

Answer 3

2 and 3