Where Math Gets Real
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Where Math Gets Real
*with white behind logo Drawing Circles A circle is a figure made by a closed curve. All the points on the circle are the same distance from the center. You can use a ruler and compass to construct a circle. Remember, the radius is a segment that extends from the center to any point on the circle. YOUR TURN ✎ 1. The bottom of a glass water bottle has a diameter measuring 5 centimeters. Draw a circle the size of the water bottle. Where Math Gets Real Where Math Gets Real EXAMPLE: The diameter of April’s sport bottle is 6 centimeters. Draw a circle with the same measure.
Step 1: To draw a circle with a compass, you need to use the radius, which is half the diameter. If you are given the diameter, divide it by 2 to find the radius.
6 cm ÷ 2 = 3 cm
The radius of the circle is 3 centimeters.
Step 2: Use your ruler to draw a line segment that’s 3 centimeters long.
2. A U.S. quarter’s diameter is 1 inch. Draw a circle the size of a quarter.
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3. Jim is making a dream catcher. The hoop of the dream catcher is a circle with a radius measuring 4 centimeters. Draw a circle of the same size.
Step 3: Place the point of the compass on one end of the line segment you drew in step 2. Extend the compass so that the pencil point touches the other end of the line segment.
Step 4: Rotate the compass pencil completely around the fixed point. (The fixed point is the center of the circle.)
APRIL 10, 2017 > p. 4 Wind Power! > CIRCLES
Sessions 27 & 28 81
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