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# Geometry

### Unit 9 Review

What is perimeter? length of the outline of a shape
What is circumference? distance around a circle
What is area? measurement of a surface
What is volume? amount of space encloses within
What is the area of a rectangle? length times width
What is the area of a circle? pi times radius squared
What is circumference of a circle? 2 pi times radius
What is diameter? distance across a circle
What is radius? half of diameter or half way across a circle
Area of rectangle l=4 and w=5 20
Area of a circle r=6 36 pi
Area of a circle d=10 25 pi
Volume of rectangular prism? length times width times height
Volume of a cylinder? pi times radius squared times height
What is Pythagorean theorem a squared + b squared = c squared