1.

Two identical prisms with right triangles as base are joined to form a rectangular prism as shown below:What is total surface area?

Answer»

The sides of the rectangular prism are

Length = 12 cm

Breadth = 5 cm and

Height = 15 cm.

Base area = 2 × perimeter of rectangle

2 × 12 × 5 = 120 cm2

Lateral surface area = base perimeter × height

= 2 (length + breadth) × height = 2(12 + 5) × 15

= 2 × 17 × 15 = 510 cm2

Total surface area = 120 + 510 = 630 cm2



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