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erica [24]
3 years ago
15

A building engineer analyzes a concrete column with a circular cross section. The circumference of the column is 18pi meters.

Mathematics
1 answer:
IgorLugansk [536]3 years ago
6 0

Answer:

  • 81π m²

Step-by-step explanation:

Circumference formula: C = 2πr

Compare with given value and determine the radius:

  • 2πr = 18π
  • r = 18π/2π
  • r = 9 m

Find the area of the cross-section.

Area formula: A = πr²

Area: A = 9²*π = 81π m²

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