Question

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Answer 1

The answer is (D) ....

Answer 2

Pythagoraen theorme

for legs length a and b
the distance of the hyptonuse is c then
a²+b²=c²
if we solve for c then
$c= \sqrt{a^2+b^2}$

one leg is length p
the other is length r
so the distance is $c= \sqrt{r^2+p^2}$
D is answer