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Circles

Circles

Circles: You Are Chordially Invited True or False

1. Which of the following is a false statement? -> A diameter of a circle is also a chord of the same circle.
2. O has a radius of 2 cm. What is the length of the longest chord of ⊙O you can possibly draw? -> 4 cm
3. In the figure below, AC and BD are diameters of ⊙O. AB must be congruent to what other segment?

-> CD

4. An angle is inscribed in a circle and intercepts an arc with measure 78°. What is the measure of the inscribed angle? -> 39°
5. In the figure below, points A, B, and C are on ⊙O. Which of the following must be true?

-> m∠AOB = 2 × m∠ACB

6. In the figure below, points A, B, and C are on the circle and AB = BC = CA. What is the measure of arc AB?

-> 120°

7. In the figure below, points A, B, and C are on the circle and ∠ACB is a right angle. Which of the following statements must be true?

-> AC > AB

8. Which of the following measures cannot be the measure of an inscribed angle? -> 180°
9. An inscribed angle has a measure of 45°. What is the measure of the arc it intercepts? -> 180°
10. An inscribed angle has a measure of 58°. What is the measure of the arc it intercepts? -> 116°

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