# Classifying figures with coordinates | Analytic geometry | High school geometry | Khan Academy | Summary and Q&A

5.0K views
June 25, 2020
by
Classifying figures with coordinates | Analytic geometry | High school geometry | Khan Academy

## TL;DR

To determine if a parallelogram is a rectangle, we need to check if its adjacent sides intersect at right angles.

## Install to Summarize YouTube Videos and Get Transcripts

### Q: How can we determine if a parallelogram is a rectangle?

To determine if a parallelogram is a rectangle, we check if its adjacent sides intersect at right angles. If they do, then the parallelogram is a rectangle.

### Q: What is the relationship between a parallelogram and a rectangle?

All rectangles are parallelograms, but not all parallelograms are rectangles. A rectangle is a special type of parallelogram where all angles are right angles.

### Q: Why is it important to check if the adjacent sides of a parallelogram intersect at right angles?

Checking if the adjacent sides of a parallelogram intersect at right angles is important because a rectangle is defined by having all angles as right angles. If the adjacent sides intersect at right angles, then the parallelogram is a rectangle.

### Q: What is the significance of finding perpendicular slopes in determining if a parallelogram is a rectangle?

Finding perpendicular slopes between the adjacent sides of a parallelogram indicates that the sides intersect at right angles, confirming that the parallelogram is a rectangle.

## Summary & Key Takeaways

• A parallelogram is a quadrilateral with opposite sides parallel.

• Not all parallelograms are rectangles, but all rectangles are parallelograms.

• To determine if a parallelogram is a rectangle, we need to check if its adjacent sides intersect at right angles.