Calculate the area of a rectangular field where one side is 16 cm and the diagonal is 20 cm.
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 192 cm2
The diagonal of a rectangle makes a right triangle with two adjacent sides, so the other side follows from Pythagoras’ theorem; the area is then length × breadth.
Other side \(=\sqrt{20^2-16^2}=\sqrt{400-256}=\sqrt{144}=12\) cm
Area \(=16\times12=192\) cm2