Respuesta :

Answer:

D

Step-by-step explanation:

Lateral SA = area of the 4 triangles

Formula to be used :-

Area (triangle) = 1/2bh

=> 4 x 1/2 x 9 x 12

=> 108 x 2

=> 216 cm²

Total SA = LSA + area of the square

Formula to be used :-

Area (square) = side length x side length

=> 216 + 9 x 9

=> 216 + 81

=> 297 cm²

The correct option is (D).

LSA:-

Area of one triangle:-

  • 1/2(Base)(Height)
  • 1/2(9)(12)
  • 6(9)
  • 54cm²

LSA

  • 4(54)
  • 216cm²

TSA:-

Area of square:-

  • side²
  • 9²
  • 81cm²

TSA:-

  • 81+216=297cm²

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