Formulae for perimeter and area of 2D shapes
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Rectangle Perimeter | 2L + 2B
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| Rectangle Area | lb
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| Triangle Area | 1/2 bh
or
bh/2
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| Circle Circumference | πD
or
2πr
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| Circle Area | πr²
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| Arc length Length | θ/360 x πD
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| Arc length Perimeter | θ/360 x πD + 2r
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| Arc length Area | θ/360 x πr²
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| Square Perimeter | 4S
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| Square Area | S²
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| Trapezium Area | 1/2h(a+b)
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| Rhombus Perimeter | 4S
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| Rhombus Area | 1/2xy (x and y being diagonals)
or
xy/2
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| Parallelogram Perimeter | 2l + 2b (where l and b represent the parallel sides)
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| Parallelogram Area | bh (where b represents the set of parallel sides perpendicular to the height)
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| Quadrilateral | There is no formula. The area is found by joining opposite corners to form two triangles. The sum of the areas of the two triangles gives the area of the quadrilateral.
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Created by:
turfewisawesome
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