15. 210 4.5 yd 16. 21.4 m 17. The sector of a circle has a central angle of 144' and an area of 70.7 square meters. Find the radius of the circle. 18. A circle with a radius of 15 yards contains a sector with an area of 609 yd. Find the measure of the central angle of the sector in both radians and degrees. 19. A wall clock is equally divided into 12 sections. If the clock reads 8:00 and has a diameter of 12.5 inches, find the area of the smaller sector formed by the minute and hour hands.

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