Question

In a rectangle, length of two sides are given as 20 and 21 cm. Find the length of the diagonal in cm.

• A. 29

Answer 1

The correct option is A 29
If we know the lengths of two sides of a rectangle, we can find the length of the diagonal of the rectangle.
Rectangle is divided into two right-angled triangles by a diagonal.
If we apply pythagoras theorem in one of the triangles,
$(diagonal{)}^2=(20{)}^2(21{)}^{2}diagonal=\sqrt{400+441}=\sqrt{841}=29cm$