Question 881720
In a right triangle, {{{a^2}}}+{{{b^2}}}={{{c^2}}} where a and b are the legs and c is the hypotenuse.
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3^2 + 6^2 = x^2
9 + 36 = x^2
45 = x^2
Take the square root of each side to get
6.7082 = x (or "the square root of 45")
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For the second equation, a rectangle is simply two right triangles together. Same formula.
10^2 + 8^2 = x^2
100 + 64 = x^2
164 = x^2
12.0862 = x (or "the square root of 164")