Respuesta :

Step-by-step explanation:

the area of the triangle is= 1/2 b x h

1/2 (5÷2) × 9 = 11.25cm²

Area for the square = side × side

5×5 = 25cm²

Total surface area = area of the triangles + area of the square

11.25 ×4 + 25 = 70cm²

total area is 70cm²

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Answer:

  • Area of the four triangles = 90 cm²
  • Area of the square = 25 cm²
  • Total Surface Area = 115 cm²

Step-by-step explanation:

Area of a triangle = 1/2 x base x height

Each of the four triangles in the square pyramid has a base of 5 cm and a height of 9 cm
Area of each triangle = 1/2 x 5 x 9 = 45/2
Area of all 4 triangles = 4 x 45/2 = 2 x 45 = 90 cm²

Area of the square = 5 x 5 = 25 cm²


Total surface area = 90 + 25 = 115 cm²

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