Question

In a right angled triangle , the measure of the hypotenuse is 41 cm and measure of one of the side is 9 cm, find the measure of the third side

• A. 40 cm
• B. 20 cm
• C. 21 cm
• D. 24 cm

Answer 1

The correct option is A

40 cm

Let the measure of the third side be $x$

By Pythagoras Theorem ,we have

$x^2+9^2={41}^2$

$x^2+81=1681$

$x^2=1681-81=1600$

$x=\sqrt{1600}$

$x=40cm$

Hence the length of the third side is 40 cm