In a right-angled triangle. If the hypotenuse is 101 cm and one of its sides is equal to 20 cm, what is its area (in cm2)?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 990.
Let the other side = b
Using Pythagoras: 1012 = 202 + b2
⇒ 10201 = 400 + b2
⇒ b2 = 9801
⇒ b = 99 cm
Area = (1/2) × base × height
= (1/2) × 20 × 99
= 990 cm2