Find the area of right angled triangle whose hypotenuse is 15 cm and one of the sides is 12 cm.  Pick
A) 34 cm ²  B) 38 cm ²  C) 54 cm ²  D) 56 cm ²  E) 64 cm ²

Rationale: ab ² = ac ² - bc ² = 15 ² - 12 ² = 225 - 144 = 81 therefore , ab = 9 therefore , area of the triangle = ¹ / ₂ × base × height = ¹ / ₂ × 12 × 9 = 54 cm ² answer : c
Answer: C