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### Course: MAP Recommended Practice>Unit 8

Lesson 4: Missing angle problems

# Find measure of vertical angles

Given two intersecting lines and the measure of vertical angles, watch as we solve to find the measure of the remaining angles. Created by Sal Khan.

## Want to join the conversation?

• I still don't fully understand this is there another video to help me?
• For some reason, whatever the number is on the other side is your answer
• you may never use them. But it's good to learn them, just in case an everyday problem comes up that involves angles. You'll be able to solve it and help everyone else out because you saw that video on Khan Academy in 7th grade. :)
• Who would remember this
• I have no idea how to do this. I feel so stupid. How do I find the value of the angles? Every time I type out an answer, it ends up being an answer that was right in front of me the whole time. Can someone help me?
• I think you have probably figured it out by now, but here's what's worked for me.

Figure out if the angle is:
complementary (adds up to 90 degrees) or
supplementary (adds up to 180 degrees)

Then take the given value and subtract it from 180 or 90, depending on the type of angle.
examples:

X=47, complementary angle
90 - 47 = 43
the angle is 43 degrees

Y=125, supplementary angle
180 - 125 = 55
the angle is 55 degrees

Hope this helps!
(1 vote)
• guys it makes sense wdym
• I'm so confused. How do we fine the remaining angles?
• do u guys get in because I am confuzzled
• The two angles in between the yellow lines are the same which means that each angle has to have the same value. Soooo if you can find a (the smallest) number for x that makes both side the same number... YOU WIN MATH

BTW The x right next to the 7 means there is an inviscible times simbul if you were wondering

You don't always have to use the technique that they use! What works for you works for you. Hope this helps :)
(1 vote)
• I'm confused someone explain it all to me
• So Basically, 60 degrees + x = 7x, so if you subtract the x on both sides , you get 60 = 6x, because x = 1x ! The whole area is 70 degrees, and 7x is 70 divided by 7, which is 10 ! So x is 10 !