4(a) . a^2 + b^2 = c^2....where a and b are the legs and c is the hypotenuse
12^2 + b^2 = 13^2
b^2 = 13^2 - 12^2
b^2 = 169 - 144
b^2 = 25
b = sqrt 25
b = 5 <== ur missing leg(t) = 5
(b) a^2 + b^2 = c^2
a^2 + 9^2 = 12^2
a^2 = 12^2 - 9^2
a^2 = 144 - 81
a^2 = 63
a = sqrt 63
a = 7.9 <== ur missing leg(a)
(c) a^2 + b^2 = c^2
6^2 + 9^2 = c^2
36 + 81 = c^2
117 = c^2
sqrt 117 = c
10.8 = c <== ur hypotenuse (x)
