Find the area (in cm2 ) of a triangle whose length of each side is 7 cm, 24 cm and 0.25 m.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 84 .
Sides of triangle = 7 cm, 24 cm, 0.25 m
Convert 0.25 m to cm, 0.25 × 100 = 25 cm
Semi-perimeter s = (7 + 24 + 25) ÷ 2 = 28 cm
Area = √[s × (s − a) × (s − b) × (s − c)]
= √[28 × (28 − 7) × (28 − 24) × (28 − 25)]
= √[28 × 21 × 4 × 3]
= √7056
= 84 cm2