Types of Types of AnglesAngles

Acute AngleAcute Angle

                            Any angle that measures less than 90o 

Right AngleRight Angle

                            Any angle that measures exactly 90o 

Obtuse AngleObtuse Angle

                            Any angle that measures more than 90o, but less than 1800 

Straight AngleStraight Angle

                            Any angle that measures exactly 180o 

Angle Angle RelationshipsRelationships

The definitions we looked at earlier The definitions we looked at earlier apply to angles when we look at apply to angles when we look at one one angleangle

But  there are also some special But  there are also some special relationships between relationships between pairs of anglespairs of angles

Adjacent AnglesAdjacent Angles

                            Two angles that are next to

each other and share one side 

Vertical AnglesVertical Angles

                           

Two angles that are across from each other.

They are always equal in measure. 

Complementary Complementary AnglesAngles

                            Two angles that add up to exactly 90o 

Supplementary Supplementary AnglesAngles

                            Two angles that add up to exactly 180o 

Practice!Practice!Can you name each angle?

Obtuse Acute Vertical

Supplementary

Supplementary

Complementary

180o – 98o = 82o

Can you find the missing angle?

90o – 53o = 37o

Vertical angles are equal,so x is 51o

Now that you have finished Now that you have finished your angle notes, return to your angle notes, return to the math website and start the math website and start the next sectionthe next section