Respuesta :

mhanifa

Answer:

#5

Area of side faces:

  • A = 2(18 + 14)*14 = 896 cm²

Area of bottom face:

  • A = 18*14 = 252 cm²

Area of 2 triangular faces:

  • A = 16*14 = 224 cm²

The height of the remaining triangular faces:

  • h² = 16² - (18/2)² + (14/2)² = 224
  • h ≈ 15 cm

The area of 2 triangular faces:

  • A = 15*18 = 270 cm²

Paper needed:

  • 896 + 252 + 224 + 270 = 1642 cm²

#6

Let the perimeter of the base is P.

If the height is increased by 1.5 cm then surface area is increased by:

  • 1.5P

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