Question

find the perimeter of a rectangle whose one side measure 21 cm and the diagonal is 29​

Answer 1

Answer:

82 cm square

Hope it helps

Answer 2

Answer:

82 cm is the correct answer.

Given:

one side of a rectangle measures 21 cm and the diagonal is 29​ cm

To find:

the perimeter of a rectangle

Solution:

to find the perimeter, we need to find the other side.

using Pythagoras theorem [a rectangle has 4 equal, 90-degree angles]

h² = p² + b²

29² = p² + 21²

841 = p² + 441

p² = 841- 441

p = √400

p = 20

so, the other side of the rectangle = 20 cm

perimeter of rectangle = 2 (a+ b)

perimeter of rectangle = 2 ( 21 + 20 )

perimeter of rectangle = 2 x 41

so, perimeter = 82 cm

Hence, 82 cm is the correct answer.

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