The Ithaca High School Geometry Blog

Here are the answers to the quiz:

1. By the converse of the Pythagorean Theorem, 10²  + 24² = 26² , so AB is perpendicular to CB, so YES, AB is tangent to circle C.

2. NO. Don’t trust the diagram! The segment BC looks like the hypotenuse of right triangle, but the hypotenuse of this triangle is the supposed tangent segment. Since 5²  + 13²  is not equal to 12² , angle CAB is not a right angle.

3. 100°

4. 80°

5. 260°

6. 180°

7. 3

8. 7

This entry was posted on March 28, 2008 at 2:28 pm and is filed under Class notes. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.