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Name ___________________________________________Date ____________Hr ______HW#____Unit 3 Review~ Circumference and Area 1. Here is a circle with center and some line segments and curves joining points on the circle.0254000True or False?AB is a radius ___________OC is a radius ___________PQ is a diameter ___________BA is a diameter ___________If BA=6, then OC= 3___________If OA=4, then PQ= 8___________BA= PQ ___________OB= AO ___________OC= PQ ___________2. Matthew measured some circles and recorded his measurements. Which measurements are acceptable, and which are inaccurate. Show a reason why for each.diameterCircumferenceDo these measurements make sense?Why or why not?5.2 cm1.7 cm14 cm56 cm19.1 cm59.2 cm6.2 cm19.5 cm16 cm33.6 cm3. Complete the table. Use 3.14 for π. Label each answer.radiusdiameterCircumference8.9 ft3.2 cm25 in10.6 cm49 cm32.6 m4286252197104. If AE = 12 m, find: AG ______________CD _______________ circumference of circle A _________________If FE = 10, findAG ______________CD _______________ circumference of circle A _________________5. Identify each measurement as the diameter, radius, or circumference of the circular object. Then, find the other two measurements for the circle. Be sure to indicate which is which measurement.The crust on a pizza is 37.7 inches. This represents _____________________.You swim straight across a circular pool for 30 ft. This represents ___________________.The blade on a fan is 18 inches. This represents ______________________.6. Find the distance around this figure. 7. The diameter of a bike wheel is 30 inches. If the wheel makes 10 complete rotations, how far does the bike travel?8. The wheels on William’s bike are 20 inches in diameter. He rode for 78.5 feet. How many times did his tires rotate?Estimating Area9. Estimate the area of Alberta in square miles. Show your reasoning.184785013525510.Circle A has a diameter of approximately 20 inches and an area of approximately 300 in2.Circle B has a diameter of approximately 60 inches.Could these be the?area of Circle B? State yes or no and explain your reasoning.a)About 100?in2b)About 300?in2c)About 900?in2d)About 2,700?in211. A circle’s circumference is approximately 44 plete each statement using one of these values: 7, 11, 14, 22, 88, 138, 154, 196, 380, 616.a)The circle’s diameter is approximately ________ cm.b)The circle’s radius is approximately ________ cm.c)The circle’s area is approximately ________ cm2.12.Here is a picture that shows one side of a child's wooden block with a semicircle cut out at the bottom.Find the area of the side. Explain or show your reasoning.Find the area in terms of pi. ................
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