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** How to Draw a Circle.**

Spend some time familiarizing yourself with the tools that are available in this applet.

**(1). Then draw and label Circle A, with a diameter of 6 cm.**

**(2). Draw and label Circle B, with a radius of 5 cm. **

**(3). Draw and label Circle C, with a radius that is equal to Circle A’s diameter.**

**(4). Draw and label Circle D, with a diameter that is equal to Circle B’s radius.**

**(5). Use a compass app below to recreate one of these designs.**

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** Draw Radius and Diameter of a Circle.**

- Use the geometric tool in the applet below to draw a circle.
- Draw and measure a radius and a diameter of the circle.

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** Name the Radius and Diameter of a Circle.**

Here is a circle with center H and some line segments and curves joining points on the circle.

(1). Identify example(s) of a diameter. Explain your reasoning.

(2). Identify example(s) of a radius. Explain your reasoning.

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**Sort these pictures into two groups.**

**Explain why you sorted the objects like you did.**

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On January 3rd, Earth is 147,500,000 kilometers away from the Sun. On July 4th, Earth is 152,500,000 kilometers away from the Sun. The Sun has a radius of about 865,000 kilometers.

Could Earth’s orbit be a circle with some point in the Sun as its center? Explain your reasoning.

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Lin measured the diameter of a circle in two different directions. Measuring vertically, she got 3.5 cm, and measuring horizontally, she got 3.6 cm. Explain some possible reasons why these measurements differ.

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