Exterior Angle Proof and Practice

 $m\angle ECD$  =__________

• 139 degrees

• 41 degrees

• 120 degrees

• 79 degrees

Tags

CCSS.8.G.A.5

Solve for  $m\angle BCF$  .

• 80 degrees

• 9 degrees

• 145 degrees

• 65 degrees

Tags

CCSS.8.G.A.5

Fill in statement #2.

• $m\angle1+m\angle2+m\angle3=180$

• $m\angle3+m\angle4=180$

• $m\angle2+m\angle4=180$

• $m\angle1+m\angle3=180$

Tags

CCSS.8.G.A.5

Fill in reason #3.

• Triangle Sum Theorem

• Reflexive Property

• ASA

• definition of supplementary

Tags

CCSS.8.G.A.5

Fill in statement #4.

•  $m\angle3+m\angle4=m\angle1+m\angle2+m\angle3$ 

•  $m\angle1+m\angle2=m\angle4$ 

•  $m\angle2+m\angle4=180$ 

• $m\angle1+m\angle3=180$

Tags

CCSS.8.G.A.5

Fill in statement #5.

•  $m\angle4=m\angle1+m\angle2$ 

•  $m\angle1+m\angle3=m\angle4$ 

•  $m\angle2+m\angle4=180$ 

•  $m\angle1+m\angle2+m\angle3=180$ 

Tags

CCSS.8.G.A.5

Fill in reason #5.

• Transitive Property

• Exterior Angle Theorem

• Substitution Property

• Subtraction Property

Tags

CCSS.8.G.A.5