Question

Find the perimeter of rectangle whose length is 40cm and a diagonal is 41cm?

Answer 1

Answer:

Step-by-step explanation:

H = 41cm , p=40cm

abcd is a rectangle

We Know that it have 90* at each side, so on joining 1 Digonal

H=41

H²-p²=b²

(41)²-(40)²=b²

1681-1600=b²

B²=81

B=±9 = 9cm

L=40cm , b =9cm

Perimeter = 2(l+b)

=2(40+9)

= 2×49 = 98cm

Hope it works

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