Multiple choice

The base of the right prism is a triangular with sides 20 cm, 21 cm and 29 cm, If its volume is 7560 cm3 then its lateral surface area is ?

  1. 2484 cm2

  2. 2556 cm2

  3. 2520 cm2

  4. 2448 cm2
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The triangle with sides 20, 21, 29 is a right triangle (20² + 21² = 29²). Base area = (1/2) × 20 × 21 = 210 cm². Height = Volume / Base area = 7560 / 210 = 36 cm. Lateral surface area = Perimeter × Height = (20 + 21 + 29) × 36 = 2520 cm².

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