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The total surface area of a right pyramid on a square base of side 10 cm with height 12 cm is :
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- 260 square cm
- 360 square cm
- 330 square cm
- 300 square cm
- 260 square cm
Correct Option: B
Slant height of pyramid = √5² + 12² = √25 + 144
= √169 = 13 cm.
| Lateral surface area of pyramid = | × perimeter of base × slant height | |
| 2 |
| = | × 4 × 10 × 13 = 260 sq. cm. | |
| 2 |
Area of base = 10 × 10 = 100 sq.cm.
∴ Total surface area = 260 + 100 = 360 sq.cm.
