A rectangle measuring 10 by 6 has a right triangle with legs 4 and 3 cut from one corner. What area remains?

Correct answer to question 185 (Mathematics Knowledge): 54

Method

The rectangle's area is 10 x 6 = 60. The triangle removed has area 4 x 3 / 2 = 6. Subtracting gives 60 - 6 = 54.