मराठी

Revision: Area and Perimeter of Plane Figures Mathematics (English Medium) ICSE Class 9 CISCE

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Definitions [2]

Equilateral Triangle: A triangle in which all three sides are of equal lengths is called an equilateral triangle.

Isosceles Triangle: A triangle in which two sides are of equal lengths is called an isosceles triangle.    

Area of a circle: The area of a circle is the region occupied by the circle in a two-dimensional plane.

Formulae [4]

Formula: Perimeter

Perimeter = Sum of all side lengths

Perimeter of a Triangle = 3 × length of a side.

Area of quadrilateral = `1/2` d (height1 + height2) where d denotes the length of diagonal.

Area of the circle = πr2

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