Question 859848
To test if a triangle is right, you should use the <b>Pythagorean Theorem</b>.
{{{a^2+b^2=c^2}}}
Because the sides 47 and 66 are shorter, they are the <i>legs</i>.
{{{47^2+66^2=c^2}}}
Because 89 is the longest, it is the <i>hypotenuse</i>.
{{{47^2+66^2=89^2}}}
Next, find the squares
{{{2209+4356=7921}}}
Add the numbers together
{{{6565=7921}}}
<h3>Because the numbers don't fit in the pythagorean theorem, the triangle is <i>not</i> right.