What is the length of a diagonal of a rectangle whose dimensions are 20m and 15m?

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20m

25m

15m

30m

answer is B.

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Detailed Solution

It is given that the length of a diagonal of a rectangle whose dimensions are 20m and 15m.
The length of a diagonal of a rectangle with length l unit and breadth b unit is =

l 2 + b 2

unit.
Length of the rectangle = 20 m.
Breath of the rectangle = 15 m.
Then, the length of a diagonal of the rectangle is given by:

⇒ L = 202 + 152 ⇒ L = 400 + 225 ⇒ L = 625 ⇒ L = 25

Hence, a rectangle with the measurements 20 m by 15 m has a diagonal that measures 25 m.
Therefore, option 2 is correct.

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