Question

find the perimeter of a rectangle whose length is 40 centimetre and diagonal is 41 cm
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Answer 1

Using the formulas

P=2(l+w)

d=w2+l2

Solving forP

P=2l+2d2﹣l2=2·40+2·412﹣402=98cm

Perimeter = 98 cm.

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Answer 2

Answer:

The perimeter of the rectangle = 2 ( Length + Width )

= 2 ( 40 cm + 9 cm )

= 2 x 49 cm

= 98 cm

Hence the perimeter of the rectangle is 98 cm.