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math test facts
things I need to know for the math test
| Question | Answer |
|---|---|
| square perimeter | length + length + width + width |
| area of a square | length . width |
| perimeter of a triangle | add all sides |
| area of triangle | 1/2 . base . height |
| the diameter is what times the radius | 2 times the radius |
| radius | half of the diameter |
| circumference of a circle | C= 2 pi/ times radius |
| circumference when diameter is given first | c=d pi |
| Area of a circle | pi radius to the second power= r times 2 pi |
| trapezoid area | 1/2 height times base1 and base2 |