## Tuesday, May 3, 2011

### Scribepost May 3, 2011

Today in Math, we continued on circle geometry.

Basically, Backé taught us more on how to figure out the the angle of an inscribed angle by looking at its central angle. He also gave us words and diagrams that we need to know.

First, he showed us something we should know already. Here are kinds of triangles according to sides.....

Equilateral Triangles are triangles with 3 equal sides, Isosceles Triangles have 2 equal sides, while Scalene Triangles have no sides equal.

....and here are other triangles according to their angles.

Acute Triangles have 3 acute angles, Right triangles have 1 right angle and 2 acute angles, Obtuse Triangles have 1 obtuse angle and 2 acute angles.

He mentioned the word "Theta" which means an unknown angle.

Then he gave us this table....

It simply means that
• an angle that has an angle between 0 and 90 degrees is called an acute angle.
• an angle that has an angle of 90 degrees is called a right angle.
• an angle that has an angle between 90 and 180 degrees is called an obtuse angle.
• an angle that has an angle of 180 is called straight angle.
• angles that has an angle between 180 and 360 are called reflex angles.
wait there's more...

He also showed us facts about the total angle of polygons.
- sum of all angles of a triangle = 180 degrees
- sum of all angles of a quadrilateral = 360 degrees

------------------------------------------------------------------------------------------------
That is about it. Comment if I did anything wrong or if I missed stuff.

***Bring a PROTRACTOR with you because we'll be needing it in this chapter***