The Ithaca High School Geometry Blog

Assignment for Friday, March 28, 2008

Due Monday, 3/31/08

Today’s assignment is worksheet 10.4 Practice B.

On Monday we will look at Lesson 10.5, so if you are bored this weekend, you may want to look ahead at all the exciting new theorems that I think you should know.

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