Class Summary 9B 13/11

Today we started the class with Mrs. Saatkamp checking what the groups had done for the project.
After we revised the theorems 5-8, 5-9, 5-10 and 5-11 and corollary 5-1.

• Theorem 5-8: The exterior angle is greater than each of the remote interior angles
• Theorem 5-9: If one side is longer than another side then the angle opposite to the longer side is greater than the angle opposite to the shorter side.
• Theorem 5-10: (converse of T 5-9) If one angle is greater than another angle then the side opposite to the bigger angle is longer than the side opposite to the smaller angle.
• Theorem 5-11: The shortest path from one point to a line is a perpendicular segment.
• Corollary 5-1: The shortest path from one point to a plane is a perpendicular segment.

After Mrs. Saatkamp revised each of these theorem and corollary she started to correct the homework from page 263 # 15 - 32, except 30 (i think)

We correct everything even proovngs.

Prooving number 29 was easy and had 4 steps.

But prooving 31 was really difficult and we had to use corollary 4-2 that we never thought we would have to use and it was 12 steps.

Although we had to do prooving number 32 we didn't correct it in class because we didnt have enough time to do it. I think we starting the class tomorrow by correcting it and Mrs. Saatkamp said it is also 12 steps. And tomorrow i think we are learning a new lesson.

P.S.: No homework for tomorrow because we didn't learn a new lesson yet.