Question

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

Answer 1

by Pythagoras thereom se breadth find karo uske baad 2 (l+b)

Answer 2

The diagonal of the rectangle divides it into two right-angled triangles, so we can use the pythagorean theorem to solve this problem. 

35cm is the diagonal and 28cm is the length.

hyp² = length² + breadth²

35²   = 28² + breadth²

1225= 784 + breadth²

1225 - 784 = breadth²

breadth² = 441

breadth = √441

= 21cm

Perimeter = 2( l + b )

              = 2 * (28 + 21)

              = 2 * 49

              = 98cm

The perimeter of the rectangle is 98cm.