1. 10.4 and 10.9 Quick clicker check

2. The centers of two circles with radii of 5 and 10 are 39 units apart
The centers of two circles with radii of 5 and 10 are 39 units apart. Find the length of the common internal tangent.

3. Find the measure of an arc that is
of a circle.

4. A circle has diameter length .
If an arc of that circle is , what is the
measure of the arc?

5. The circumference of a circle is 18. 6
The circumference of a circle is What is the arc length of an arc measuring 72°?

6. In the diagram below, O is the center of the circle and triangle ABC is equilateral. What is ?

7. In the diagram below, O is the center of the circle and triangle ABO is equilateral. What is ?

8. The radius of the large circle is 24 cm and the radius of the small circle is 8 cm. The distance between the centers of the circles is 32. What is ?

9. How far will a bicycle travel if the wheels rotate 1000 times
How far will a bicycle travel if the wheels rotate 1000 times? The diameter of the wheel is 70 cm. Round to the nearest cm, then meter.

10. With the same bike, how many revolutions will the wheel make if it travels 15 meters? Round to the nearest revolution.

11. The track is composed of two straight sections 50 meters long and two semicircles. The inside of the track is 4 meters from the outside at all points. Find, to the nearest meter, the length of the inside of the track and the length of the outside of the track. What is the difference between the two distances?