Area of a triangle= 0.5 x b x h
Area of a Parallelogram= base x vertical height / b x h
Area of Trapezium= average of parallel side x distance between them / 0.5 x (a+b) x h
Area of a Circle= pi x r (squared)
Circumference= pi x d
Area of a sector= angle of sector/ 360 x area of full circle
length of arc= angle of sector/360 x circunference of full circle
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