Question

Find the length of the arc shown in red. Leave your answer in terms of π

Answer 1

2pi x r (0/360)
42pi(60/360)
Answer 7pi

Answer 2

• 14π

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The arc in red has the measure of:

• 180° - 60° = 120°

The diameter is d = 42 ft.

Use arc length formula:

• s = πd(α/360), where α is the arc measure in degrees

Substitute 42 ft for d and 120° for α:

• s = 42π(120/360) = 42π/3 = 14π feet