Question

Mrs. Kaushik gives a problem to her students. Find the perimeter of a rectangle whose length is 28 cm and diagonal is 35 cm.

Answer 1

Answer:

Perimeter of rectangle

I=28cm,d=35, b=vd^2-I^2

b =v35^2-28^2 =v44l=21

P=2(I +b) = 2(28+21) = 2x49=98

Perimeter=98cm

Answer 2

Answer:

perimeter=28cm

diagonal=35 cm

p=2(l+b)

=2(28+b)

=56+b

by pythagoras theorem

(35)2 =(28.)2 +(b)2

1225-784=b2

441=b2

b=21

therefore perimeter = 56+42=98cm