Question

What is the value of the hypotenuse of a right triangle whose sides are $12$ and $18$?

• A. $4.24$
• B. $3.46$
• C. $2.16$
• D. $21.63$

Answer 1

The correct option is D $21.63$

Let the sides be $a=12$ and $b=18$

Le the hypotenuse be $c$

Using Pythagoras theorem

$c^2=a^2+b^2{c}^2={\left(12\right)}^2+{\left(18\right)}^2{c}^2=144+324c^2=468c=\sqrt{468}c=21.63$