Question

which of these shapes is a right isosceles triangle?

Explanation:

Step1: Recall the properties of a right - isosceles triangle

A right - isosceles triangle has one right angle ($90^{\circ}$) and two equal sides.

Step2: Analyze each triangle

• The red triangle: It has a right angle and two equal sides.
• The pink triangle: It is not a right triangle.
• The green triangle: It is an isosceles triangle but not a right triangle.
• The blue triangle: It is a right triangle but not isosceles.

Answer:

The red triangle.