Precalculus Arc Length

Find the area of the shaded sector of circle O.  The radius is 6 inches and the central angle is 100°.  Express answer to the nearest tenth of a square inch.

• 9.2 sq. in.
• 10.5 sq. in.
• 31.4 sq. in.
• 38.2 sq. in.

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

• 7/4π
• 7/2π
• 1/8π
• 45π

Find the arc length.

• 5.50 cm
• 11.00 cm
• 0.39 cm
• 141.37 cm

If the length of the 45° region of this circle is 10 inches, what is the radius of the circle?

• 1.6in
• 3in
• 6.8in
• 2.5in

In a​ circle, a 90° sector has area 64π in². What is the radius of the​ circle?

• 16 in

• 32 in

• 64 in

• 128 in

Find the area of the shaded sector of the circle.

• 
• 
• 
• 

Calculate the length of the bold arc.

• 49.7 ft

• 15.8 ft

• 24.9 ft

• 3.14 ft

Calculate the length of the bold arc.

• 61.3 ft

• 20.4 ft

• 7351.3 ft

• 22,068 ft