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## Basic geometry and measurement

### Course: Basic geometry and measurement>Unit 1

Lesson 10: Area versus perimeter

# Comparing areas word problem

Sal compares the area of two posters using their side-lengths. Created by Sal Khan.

## Want to join the conversation?

• Are there any other ways to calculate area?
• Yes to find the area of a rectangle, multiply its height by its width. For a square you only need to find the length of one of the sides (as each side is the same length) and then multiply this by itself to find the area.
• how to measure a shapes like croissant or star I mean is there a way to measure it in details ?
• With more complex shapes, you're best served by dividing them into more simple forms and simple adding the areas together. A five sided star can be divided into 10 equal, obtuse triangles.
• I still do not understand it! I am getting upset / mad!
• Are there any other ways to calculate area
• What if you were given the area but had to find the perimeter r?
• Do we have to use this way?