A mason has made a concrete slab. He needs it to be rectangular. In what different ways can he make sure that it is rectangular?

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By measuring each angle is 90

°

By measuring that the diagonal of the rectangle is equal

By measuring that each pair of opposite sides are equal

All of the above

answer is D.

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Detailed Solution

A concrete slab is given.
We can use the properties of a rectangle.
A quadrilateral is a rectangle if its each angle is 90

°

, diagonals are equal and opposite sides are also equal.
So, if the slab is rectangular, it can be checked by following conditions:
(i) By measuring each angle is

90 o

.
(ii) By measuring that the diagonals of the rectangle are equal. (iii) By measuring that each pair of opposite sides are equal.
So, the mason has to ensure that all the three conditions are satisfied so that the slab becomes rectangular.
Hence, the correct option is 4.

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