If a right triangle has side lengths x + 9, x + 2, x + 10 is the hypotenuse, find the value of x

The total perimeter is 3x +21= ? first we isolate the variable by subtracting 21 on both sides. we then get 3x=21 now we divide by three on both sides and we find that x=7 to check this plug this in to x+9 x+10 and x +2 and see if x+10 is the hypotenuse.

Opposite angles in a cyclic quadrilateral add up to 180°