Question

1. Radius of base of a cylinder is 12 cm and its height is 9 cm, find its curved surface area
and total surface area, (n = 3.14)..step by step​

Answer 1

Answer:

12×9=108

Step-by-step explanation:

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Answer 2

Answer:

Lenght of the box, l = 20 cm

Breadth of the box, b = 12 cm

Height of the box, h = 10 cm

∴ Surface area of the vertical faces of the box

= 2(l + b) × h

= 2(20 + 12) × 10

= 2 × 32 × 10

= 640 cm2

Also,

Total surface area of the box

= 2(lb + bh + hl)

= 2(20 × 12 + 12 × 10 + 10 × 20)

= 2(240 + 120 + 200)

= 2 × 560

= 1120 cm2

Thus, the surface area of vertical faces and total surface area of the box is 640 cm2 and 1120 cm2, respectively.

Step-by-step explanation:

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