the following shape is made by cutting an equilateral triangle from a rectangle. find its perimeter
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The following shape is made by cutting an equilateral triangle from a rectangle.
The perimeter of shape is given as follows,
As equilateral triangle has all 3 sides equal, so we have,
The side of an equilateral triangle = a = 7.2 cm
The sides of a rectangle are 7.2 cm and 13 cm.
⇒ w = 7.2 cm and l = 13 cm
Therefore, the perimeter of the shape is,
= Perimeter of rectangle - Perimeter of an equilateral triangle
= 2 ( l + w ) - 3 a
= 2 ( 13 + 7.2 ) - 3 × 7.2
= 2 ( 20.2 ) - 21.6
= 40.4 - 21.6
= 18.8
Therefore, the perimeter of the shape is 18.8 cm.
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