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Geometry Review
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If the diameter of a circle is 24 feet, what is its radius?
12 feet Did you remember the label?
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What is the radius of ONE of the circles shown in the figure above?
6.25 in
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If the radius of a circle is 7.5 centimeters, what is its diameter?
15 centimeters Did you remember the label?
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What is the height of the triangle shown above?
12 ft
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If the diameter of a circle is 17 meters, what is its radius?
8.5 m Did you remember the label?
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Explain how to find the area of a semicircle
Find the area of a circle and then divide by 2. (pi x radius x radius divide by 2)
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ESTIMATE the circumference of a circle with a diameter of 7 inches. (use mental math and a formula chart if needed)
approximately 21 inches
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Pi is the relationship between a circle's circumference and its diameter. What value can you use to represent pi?
3.14 or 22/7 or 3 as an estimate
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The distance from one side of a circle to the other while going through the center is called its _____________________.
diameter
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What is the radius of the circle shown in the above figure?
1.5 inches
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If the radius of a circle is 18 meters, what is its diameter?
36 meters Did you remember the label?
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ESTIMATE the area of the circle shown.
75 cm Did you remember to use the radius?
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To find the radius of a circle when given its diameter, you have to ________________.
divide by 2
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Describe in words how you would find the area of the shaded figure.
SUBTRACT the area of the triangle from the area of the rectangle.
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ESTIMATE the circumference of the circle shown.
48 cm
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What is the height of the trapezoid shown?
12 cm
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The distance around a circle is called its ________________________.
circumference
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What is the base of the triangle shown?
6 yd You have to double the base, because you are only given half of the length.
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To find the diameter of a circle when given its radius, you have to _________________.
multiply the radius by 2 or double it
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The distance from the edge of a circle to its center is called the _____________.
radius
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