Question

What is the length of the diagonal of a rectangle whose width is 90 cm and whose length is 200 cm?

Answer 1

219.32 cm is the answer

Answer 2

A = 200 cm = 2 m 
b = 90 cm = 0,9 m
d = ? (m)

Pythagorean theorem
$a^2+b^2=d^2$
 ${d=\sqrt{a^2+b^2}=\sqrt{2^2+(0.9)^2}=\sqrt{4+0.81}=\sqrt{4.81}=2.19317 ...(m) \ \approx 219, 32 \ (cm)}$