Question

Find the perimeter of a rectangle of length 21 cm and diagonal 29 cm.​

Answer 1

82 cm

Step-by-step explanation:

Perimeter of a rectangle = 2( length + breadth )

Length = 21cm

We need to know value of breadth,

(Breadth)² = (Diagonal)² - (Length)² , for a

rectangle as Pythagoras Theorem is applicable for Rectangle.

So,

(Breadth)² = (29)² - (21)²

(Breadth)² = 400

Breadth = 20

So,

now perimeter =

2( 21 + 20 )cm = 82cm

Thank you.

Mark it brainliest, if you find it helpful.