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Published byVance Goodier Modified over 3 years ago

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Circle – Formulas Radius of the circle is generally denoted by letter R. Diameter of the circle D = 2 × R Circumference of the circle C = 2 × × R ( = 22/7) Area of the circle A = × R2

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**Quadrilaterals – Formulas**

Rhombus Square Rectangle Area = lb Perimeter = 2(l+b) l = length b = breadth Area = (d1d2)/2 Perimeter = 4s s = side d1,d2 = diagonals Area = s2 Perimeter = 4s (s = side) Kite Trapezium Parallelogram Area = ba Perimeter = 2(l + b) (b = base/breadth a = altitude l = length) d1, d2 = diagonals

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**Triangles – Formulas Area of a triangle = ½ × base × height**

Perimeter of an equilateral triangle = 3s (s = side) Area of an equilateral triangle

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Solids – Formulas

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Finding Perimeter and Area Review. Perimeter The distance around the outside of an object. 10 feet 8 feet 10 feet Perimeter = 10 + 8 +10 +8 = 36 feet.

Finding Perimeter and Area Review. Perimeter The distance around the outside of an object. 10 feet 8 feet 10 feet Perimeter = 10 + 8 +10 +8 = 36 feet.

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