Find the area of a triangle whose sides are 6, 8, 10.
Correct: C
Use Heron's formula to find the area. First find the semi-perimeter: s = (a + b + c)/2 = (6 + 8 + 10)/2 = 12. Then the area = √(s(s - a)(s - b)(s - c)) = √(12(12 - 6)(12 - 8)(12 - 10)) = √(12*6*4*2) = √(576) = √(24^2) = 24.