2015 · Q84
The diagonals of three faces of a cuboid are 13, {281} and 20 linear units. Then the total surface area of the cuboid is
Elementary MathematicsMensuration
- A650 square units
- B658 square units
- C664 square units
- D672 square units
Explanation
a²+b² = 169, b²+c² = 281, c²+a² = 400 give a = 12, b = 5, c = 16; total surface = 2(12·5 + 5×16 + 16×12) = 2×332 = 664 (option C).