Question

rectangle abcd has four right angles.

1. what is the sum of its angle measures? 360°
2. move vertex a to a different location. which vertex angle remains unchanged? c
3. what is the sum of the angle measures of the quadrilateral? 360
4. move vertex b to a different location. what is the sum of the angle measures of the quadrilateral?

m∠a = 90°
m∠b = 90°
m∠c = 90°
m∠d = 90°

Explanation:

Step1: Recall angle - sum property of quadrilaterals

The sum of the interior - angle measures of any quadrilateral is always 360°. This is a well - known geometric property and does not change regardless of the shape or position of the vertices of the quadrilateral.

Answer:

360°