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Derek wrote the following paragraph proof for the Vertical Angles Theorem:
The sum of angle 1 and angle 4 and the sum of angle 3 and angle 4 are each equal to 180 degrees by the definition of supplementary angles. The sum of angle 1 and angle 4 is equal to the sum of angle 3 and angle 4 by the transitive property of equality. Angle 1 is equal to angle 3 _____________________. Which phrase completes the proof? by construction using a straightedge by the definition of a perpendicular bisector by the subtraction property of equality by the vertical angles theorem
What do you think is the answer?
I belive it is A, it is definitly not D
Why not D? Do you know what Vertical Theorem is?
Because I thought it was the answer and it was marked incorrect :/
What would you do so that you would only left with <1 =<3? |dw:1439936508497:dw|
combine like terms
hallpppp im leaning towards B
What would you have to do to combine like terms? Also, You know D is wrong. Did the proof mention construction or perpendicular bisectors?
Okay so C is sticking out to me then
Sorry, I wasn't able to reply quickly. :(
fyi, D is wrong because you can't use the vertical angle thm to prove itself
We know that already...
Notice that you would subtract <4 on both sides so that <1=<3, so the proof would be SPE. :)
You guys rock <3