1. Geometry Review
Math 9

2. Geometry Review
Acute Less than 90
Obtuse Less than 90

3. Right 90
Straight 180

4. Complementary Two Angles are Complementary if they add up to 90 degrees
Supplementary Two Angles are Supplementary if they add up to 180 degrees.

5. Angles on a Line
Add up to 180.

6. Angles on a Point These angles add up to 360.
Which angles are complimentary to BRU?
 HRU and PRC

7. Opposite angles
When two lines intersect, four angles are formed. Angles 1 and 3 are called Opposite Angles as are angles 2 and 4.
1 =  3
 2 =  4

8. Pythagorean Theorem PT Rearranged a2 = c2 – b2 b2 = c2 – a2
Used to find the length of sides on triangles that contain an angle that is 90.
C is the longest side and called the hypotenuse. It is also directly across the right angle.
PT Rearranged
a2 = c2 – b2
b2 = c2 – a2

9. Sum of Interior Angles
will equal 180. a + b + c = 180 a c b

10. Categorized by Angles Acute Right Obtuse All angles are less than 90.
Contains a 90 angle.
Contains an angle greater than 90.

11. Categorized by Sides Scalene Isosceles Equilateral
Two sides are the same length.
All sides are different lengths.
All sides are the same length.

12. Now on to 10.1