Question

mr. guerra drew four figures on the board. which figure contains a right angle?

Explanation:

Step1: Recall the definition of a right angle

A right angle is an angle that measures $90^{\circ}$, and it is often denoted by a small square at the vertex of the angle.

Step2: Analyze each figure

• The first figure is a pentagon. Its interior angles are not right angles (the sum of interior angles of a pentagon is $(5 - 2)\times180^{\circ}=540^{\circ}$, and each interior angle of a regular pentagon is $108^{\circ}$, and this pentagon doesn't show a right - angle symbol).
• The second figure is a parallelogram. In a general parallelogram, the angles are not right angles (unless it is a rectangle, and this parallelogram doesn't show a right - angle symbol).
• The third figure is a triangle with a small square at one of its vertices. This small square indicates that the angle at that vertex is a right angle (measuring $90^{\circ}$).
• The fourth figure is a triangle, and there is no right - angle symbol, so it does not contain a right angle.

Answer:

The third figure (the right - angled triangle with the right - angle symbol)