1.6. Angle Classification http://www.ck12.org
- Two angles always add up to be greater than 90◦.
- 180◦is an obtuse angle.
- 180◦is a straight angle.
- Two perpendicular lines intersect to form four right angles.
- A right angle and an acute angle make an obtuse angle.
For exercises 6-11, state what type of angle it is.
- 55◦
- 92◦
- 178◦
- 5◦
- 120◦
- 73◦
- Interpret the picture to the right. Write down all equal angles, segments and if any lines are perpendicular.
- Draw a picture with the following requirements.
am p;AB=BC=BD m^6 ABD= 90 ◦
am p;m^6 ABC=m^6 CBD A,B,CandDare coplanar
In 14 and 15, plot and sketch^6 ABC. Classify the angle. Write the coordinates of a point that lies in the interior of
the angle.
14.A( 5 ,− 3 ),B(− 3 ,− 1 ),C( 2 , 2 )
15.A(− 3 , 0 ),B( 1 , 3 ),C( 5 , 0 )