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Lesson 8: Angle Bisectors



 1. 

Which statement is true about an angle bisector?
a.
An angle bisector is an angle that cuts an angle into three equal angles.
b.
An angle bisector is a line that cuts an angle into two angles.
c.
An angle bisector is a line that cuts an angle into two equal angles.
d.
An angle bisector is a line that cuts an angle at 90º.
 

 2. 

Which diagram show an angle bisector?

mc002-1.jpg
a.
A
b.
B
c.
C
d.
D
 

 3. 

Which diagram show an angle bisector?

       mc003-1.jpg
a.
A
b.
B
c.
C
d.
D
 

 4. 

What do you notice about the angle bisectors for each angle in this triangle?
                             mc004-1.jpg
a.
each bisector is divided in half by the other bisectors
b.
they intersect at one point
c.
the bisectors are parallel
d.
the bisectors are perpendicular
 

 5. 

What do you notice about the diagonals in this rhombus?

                           mc005-1.jpg
a.
the diagonals bisect the angles at 90º
b.
the diagonals divide all 4 angles into equal angles
c.
the diagonals are not angle bisectors
d.
the diagonals are angle bisectors
 

 6. 

Miguel draws an angle that measures 68º. He then constructs an angle bisector. What size are the two angles formed by the angle bisector?
a.
136º
b.
17º
c.
34º
d.
51º
 

 7. 

Mei draws an angle that measures 136º. She then constructs an angle bisector. What size are the two angles formed by the angle bisector?
a.
68º
b.
45º
c.
34º
d.
272º
 

 8. 

Sam draws an angle that measures 75º. She then constructs an angle bisector. What size are the two angles formed by the angle bisector?
a.
25º
b.
37.5º
c.
50º
d.
125º
 

 9. 

Ryan draws an angle that measures 159º. He then constructs an angle bisector. What size are the two angles formed by the angle bisector?
a.
53º
b.
81.5º
c.
62.5º
d.
79.5º
 

 10. 

An angle is drawn and then the angle bisector is constucted. The angles formed by the angle bisector each measure 43º. What size is the original angle?
a.
129º
b.
21.5º
c.
86º
d.
98º
 



 
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