Question

the diagonal of a rectangle is 5cm and one of at sides is 4cm . its area is

Answer 1

The diagonal of a rectangle forms the hypotenuse (c) of a right triangle whose sides are the sides of the rectangle.

Use the Pythagorean Theorem to find the missing side:

a² + b² = c²

4² + x² = 5²

16 + x² = 25

x² = 9

x = 3 <---- This is the length of the other side of the rectangle

Now that you know the two side lengths, find the area of the rectangle by multiplying them:

A = a*b

= 4 * 3

= 12 cm²

Answer 2

first find other side by Pythagoras theorem which would be 3cm
now find area of rectangle
3×4=12cm^2