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Rectilinear Figure:_, A plane figure bounded by the line segment is called a rectilinear figure ., Example:- triangle, rectangle, square, Pentagon etc., , Note:- A circle is not a rectilinear figure., , Perimeter:The sum of the lengths of all sides of a rectangle figure is called its perimeter., , Perimeter of triangle:-, , Perimeter of ∆ABC= (AB +BC+ CD)., EXAMPLE:- find the perimeter of a triangle whose sides are 7 cm 8.5 cm and, 9.3 cm., Solution: Perimeter of given triangle= (7+8.5+9.3) cm = 24.8 cm., , By: Chhaya Mishra

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Perimeter of a rectangle:Perimeter of rectangle = 2×(Length+Breadth), And, Length+Breadth= ½ × perimeter, Example:- 1. find the perimeter of a rectangle whose length is 28 cm and the, breadth is 17 cm., Solution: Length of rectangle = 28cm, Breadth of rectangle= 17 cm, Perimeter of rectangle= 2× (28+17), = 2×45, = 90 cm., 2. Perimeter of a rectangle is 66 m and its length is 18 m., Find its breadth., Solution:- perimeter of rectangle = 66 m, (Length + Breadth) = ½ × perimeter, = (½ ×66), = 33 m, Length = 18 m, So, Breadth = Perimeter - length, = (33-18) m, = 15 m., , By: Chhaya Mishra

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Perimeter of a square:Perimeter of a square= (4× side)., And, Side of square= ¼ × it's perimeter, EXAMPLE= find the perimeter of a square each of a square side measures 16 cm., Solution= each side of a square = 16cm., Perimeter of square= (4×side), = 4×16cm, =64cm, , By: Chhaya Mishra