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mel-nik [20]
3 years ago
8

In the diagram below what is the length of arc AC ? Round to the nearest inch.

Mathematics
2 answers:
Mandarinka [93]3 years ago
6 0

Answer:

22inches

Step-by-step explanation:

Length of an arc is expressed as

theta/360° × 2πr where:

theta is the angle subtended by the arc

r is the radius of the circle

The angle substended by the arc will be <CBA = 180°-75° = 105°

radius of the circle is BA = 24inches/2

Radius = 12inches

Length of the arc AC = 105°/360°×2π(12)

= 105°/360° × 24π

= 7/24 × 24π

= 7π

= 7 × 3.142

= 21.99 approximately 22inches

valentina_108 [34]3 years ago
4 0
As AB is a diameter, then m∠CBA=180^{0}-75^{0}=105^{0}. 
∠CBA is a central angle, so its measure multiplied by radius is the length of arc AC.
Note that 105^{0}=7\cdot 15^0 and 15^{0}= \frac{\pi}{12}. Then 105^{0}= \frac{7\pi}{12} = \frac{7\cdot 3.14}{12}=1.83 and length of the arc is 12\cdot 1.83=21,96.The correct answer is 22 in.

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