Multiple choice

The base of a right pyramid is a square of side 12 m. long. If its height be 800 cm. then the area of the lateral surface in square metre is- एक समकोण पिरामिड का आधार 12 मी. लम्बी भुजा वाला एक वर्ग है। यदि इसकी ऊँचाई 800 सेमी. है तो पार्श्विक पृष्ठ का क्षेत्रफल कितने वर्ग मीटर है?

  1. 800

  2. 240

  3. 136

  4. 308
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

For a right pyramid with square base, lateral surface area = perimeter of base × slant height / 2. Slant height l = √(h² + (a/2)²) = √(8² + 6²) = 10m. Lateral area = (4 × 12) × 10 / 2 = 240 m². Option B is correct.

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