Friday, April 10: Quiz, and Introduction to Angles

Today we took a short quiz on Rational Numbers.  If you were not here today, make sure you take this quiz on Monday!

We started our unit on angles, and today we used protractors and practiced measuring angles.  See notes below:

We started by drawing the given angles using a protractor.

Then we measured angles and defined angle terms.

We had a quick homework assignment that most students finished in class.  This is due MONDAY for those students that did not complete it before we left for the weekend.

Click here for today's homework. 

March 10: Converse of Pythagorean Theorem

Today we looked at the Converse of the Pythagorean Theorem.

Before we do that, let's consider what the Pythagorean Theorem is, because it's not JUST a² + b² = c²

The Pythagorean Theorem can be written as follows:

If a triangle IS a right triangle, then a² + b² = c².

The Converse states:

If a² +b² = c², then the triangle IS a right triangle.

Wait... isn't that the same thing?

Nope!  Think about it this way:

If it's the weekend, then we don't have school.  

What is the converse of that statement?

If we don't have school, then it's the weekend.

Is that true?  Not necessarily!  So the converse of the Pythagorean Theorem may at first seem like the exact same thing, but it really isn't!

We can use the converse to determine if a triangle is a right triangle.  If we know the side lengths, we put them into the formula and determine if the sides do in fact create a right triangle!

Click here for tonight's homework.