Mathematics 3.0 / 5 Mathematics2D and 3D shapeGCSENone Created by: AsteridCreated on: 16-08-15 18:23 How do you work out the area of a trapezuim? Add together the parallel sides and multiply by the height. Divide your answer by two. A=12(a+b)h 1 of 7 How do you work out the area of a circle? Square the radius and multiply by pi. A=πr2 2 of 7 How do you work out the circumferance of a circle? Double the radius and multiply by pi or multiply the diameter by pi. C=2πr or C=πd 3 of 7 How do you work out the volume of a prism? Multiply the cross sectional area of the prism by its length. 4 of 7 How do you work out the surface area of a sphere? Square the radius and multiply by pi. Multiply your answer by four. S.A=4πr2 5 of 7 How do you work out the volume of sphere? Cube the radius and multiply by pi. Multiply your answer by four then divide by three. V=43πr3 6 of 7 How do you work out the volume of a pyramid? Multiply the area of the base by the perpendicular height. Divide your answer by three. 7 of 7

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