Question

which of these shapes is a right isosceles triangle?

Explanation:

Step1: Define right isosceles triangle

A right isosceles triangle has 1 right angle ($90^\circ$) and 2 equal-length sides.

Step2: Analyze each shape

• Red triangle: No right angle, unequal sides.
• Green triangle: No right angle, equal sides (equilateral).
• Pink triangle: No right angle, unequal sides.
• Light blue triangle: Has a right angle, 2 equal sides.

Answer:

The light blue triangle (bottom-right shape) is a right isosceles triangle.