1.10. Vertical Angles http://www.ck12.org
One example is^6 INJand^6 MNL.
Example C
If^6 ABCand^6 DBFare vertical angles andm^6 ABC= ( 4 x+ 10 )◦andm^6 DBF= ( 5 x+ 2 )◦, what is the measure of
each angle?
Vertical angles are congruent, so set the angles equal to each other and solve forx. Then go back to find the measure
of each angle.
4 x+ 10 = 5 x+ 2
x= 8So,m^6 ABC=m^6 DBF= ( 4 ( 8 )+ 10 )◦= 42 ◦
Watch this video for help with the Examples above.
MEDIA
Click image to the left for use the URL below.
URL: http://www.ck12.org/flx/render/embeddedobject/52605CK-12 Foundation: Chapter1VerticalAnglesB
Vocabulary
Vertical anglesare two non-adjacent angles formed by intersecting lines. They are always congruent.
Guided Practice
Find the value ofxory.