Question

the diagonal of a rectangle whose length is 21cm and area is 420 sq.cm is _____cm​

Answer 1

Answer:

What find in this question?

Answer 2

SOLUTION

TO FILL IN THE BLANK

The diagonal of a rectangle whose length is 21 cm and area is 420 sq.cm is _____ cm

EVALUATION

Let breadth of the rectangle = x cm

Now it is given that length = 21 cm

So by the given condition

Area of the rectangle = 420 sq.cm

⇒ 21x = 420

⇒ x = 20

Hence the required diagonal of the rectangle

$\sf{ = \sqrt{ {20}^{2} + {21}^{2} } \: \: \: cm }$

$\sf{ = \sqrt{ 400 + 441} \: \: \: cm }$

$\sf{ = \sqrt{ 841 } \: \: \: cm }$

$\sf{ = 29\: \: \: cm }$

FINAL ANSWER

The diagonal of a rectangle whose length is 21cm and area is 420 sq.cm is 29 cm

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