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Important formula:

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Area of a square: side x side (side^{2})

Area of right angle triangle: ½ X product of sides making right angle

Area of triangle : ½ X base X height

Area of Parallelogram: Base X height

Area of Rhombus: ½ X product of diagonals

Perimeter of Rhombus: 4 X side

Area of trapezium: ½ X sum of the length of the parallel sides X height

Semiperimeter of triangle (s): a+b+c/2

Area of Triangle: √s(s-a)(s-b)(s-c)

Area of a circle: 𝜋r^{2}

Circumference of the circle: 2𝜋r

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