Question 1139854

A {{{square}}} has a side length of {{{a=20cm}}}. 

If a diagonal is drawn, a {{{square}}} is divided in two right triangles where a diagonal is hypotenuse and sides of the square are legs

use Pythagorean theorem to find the length of the diagonal {{{d}}}

{{{d^2=a^2+a^2}}}

{{{d^2=2a^2}}}

{{{d^2=2(20cm)^2}}}

{{{d=sqrt(2(20cm)^2)}}}

{{{d=20sqrt(2)cm}}}->the exact value