Question

14. Which of the following is the perimeter of the right triangle shown below?

(1) 63 cm
(2) 64 cm
(3) 70 cm
(4) 74 cm

Answer 1

3

Explanation:

Using Pythagoras formula

h^2 = (root under) p^2 +b^2

or, h^2= 20^2 + 21^2

or, h^2= 400+441

or, h^2= 841

or, h= (root under) 841

Therefore h= 29

Now,

Perimeter of a triangle= a+b+c

= 20+21+29

=70