Question

An iron pile 20 cm long and external diameter 25 cm. The thickness is 1 cm. Find the TSA of the pile.

Plz answer soon..

Answer 1

Answer:

3168 cm²

Step-by-step explanation:

Given,

An iron pile 20 cm long and external diameter 25 cm. The thickness is 1 cm.

To Find,

TSA of the pile.

Solution,

Height of pipe = 20 cm

External diameter = 25 cm

External radius = 25/2 = 12.5 cm

Thickness is 1 cm.

Internal diameter = 25 - (1 + 1) = 23 cm

Internal radius = 23/2 = 11.5 cm

Total surface area of the pipe = 2πh(R + r) + 2π(R² - r²)

==> 2*22/7*20(12.5 + 11.5) + 2*22/7*{(12.5)² - (11.5²)

==> (44*480)/7 + (44*24)/7

==> 21120/7 + 1056/7

==> 22176/7

==> 3168 cm²

Result :

TSA of the pile = 3168 cm²

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