8.3 Perimeter and Area 483 In Exercises 15–18, determine (a) the area and (b) the circumference of the circle. Use the π key on your calculator and round your answer to the nearest hundredth. 15. 8 in. a) 201.06 in.2 b) 50.27 in. 16. 13 mm a) 530.93 mm2 b) 81.68 mm 17. 13 ft a) 132.73 ft2 b) 40.84 ft 18. 16 yd a) 201.06 yd2 b) 50.27 yd In Exercises 19–22, (a) use the Pythagorean theorem to determine the length of the unknown side of the triangle, (b) determine the perimeter of the triangle, and (c) determine the area of the triangle. 19. 8 yd 15 yd c a) 17 yd b) 40 yd c) 60 yd2 20. 10 cm 24 cm c a) 26 cm b) 60 cm c) 120 cm2 21. b 13 km 5 km a) 12 km b) 30 km c) 30 km2 22. 10 in. 8 in. a a) 6 in. b) 24 in. c) 24 in.2 Problem Solving In Exercises 23–32, determine the shaded area. When appropriate, use the π key on your calculator and round your answer to the nearest hundredth. 23. 3 ft 7.73 ft2 b) A line segment through the center of the circle with both endpoints on the circle is called the _______ of the circle. Diameter c) The length of the simple closed curve that forms a circle is called the _______ of the circle. Circumference Practice the Skills In Exercises 5–8, determine the area of the triangle. 5. 1 in. 3 in. 1.5 in.2 6. 5 cm 7 cm 17.5 cm2 7. 50 cm 1 m 2500 cm2 8. 3 yd 1 ft 4.5 ft2 In Exercises 9–14, determine (a) the area and (b) the perimeter of the quadrilateral. 9. 8 ft 4 ft a) 32 ft2 b) 24 ft 10. 6 ft 2 yd a) 36 ft2 b) 24 ft 11. 24 cm 0.25 m 25 cm a) 600 cm2 b) 100 cm 12. 6 in. 13 in. 8 in. a) 78 in.2 b) 42 in. 13. 5 in. 25 in. 19 in. 2 ft 25 in. a) 288 in.2 b) 74 in. 14. 16 in. 12 in. 13 in. 13 in. 6 in. a) 132 in.2 b) 48 in. 24. 10 in. 5 in. 29.45 in.2
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