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Geometry Basics
Term | Definition |
---|---|
Perimeter | distance around a shape (add all sides) |
Area | square units in a shape (space inside a shape) |
Formula area of triangle | A=1/2bh |
Formula area of rectangle | A=lw |
radius | distance from center of circle to edge |
diameter | distance across circle through the center |
circumference | distance around a circle |
Formula area of a circle | A=π times radius squared |
Formula circumference of a circle | C= π times diameter |
If r=6 then d=? | 12 |
If d=8 then r=? | 4 |