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Area of a circle
The area of a
circle = r² (r is
the radius of the
circle)…read more

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Other shapes
The area of a triangle = half × base × height
The area of a parallelogram = base × height
Area of a trapezium = half × (sum of the parallel sides) ×
the distance between them [ 1/2(a+b)d ].…read more

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**WHEN USING FORMULAE FOR AREA AND VOLUME IT IS NECESSARY THAT ALL
MEASUREMENTS ARE IN THE SAME UNITS.**
3d shapes
Spheres: Pyramid:
Volume: 4/3r³ Volume = 1/3 × area
Surface area: of base ×
4r² perpendicular height
Cone: (=1/3r²h for circular
Curved surface Cylinder: based pyramid).
area: rl (l is slant Curved
height) surface
Volume: 1/3r²h area: 2rh
(h is Volume:
perpendicular r²h
height)…read more

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