anonymous
  • anonymous
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? A. by construction using a straightedge B. by the definition of a perpendicular bisector C. by the subtraction property of equality D. by the vertical angles theroem
Mathematics
  • Stacey Warren - Expert brainly.com
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
anonymous
  • anonymous
@ganeshie8
anonymous
  • anonymous
@taramgrant0543664

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taramgrant0543664
  • taramgrant0543664
I'm thinking its D
mathstudent55
  • mathstudent55
You can't use the reason of the vertical angles theorem to prove the vertical angles theorem.
mathstudent55
  • mathstudent55
I don't agree with the earlier statements of this proof. There are statements missing.
mathstudent55
  • mathstudent55
The answer is C, but this is a very bad proof.
mathstudent55
  • mathstudent55
Here is a better proof: Angles 1 and 4 are a linear pair, so they are supplementary. Angles 3 and 4 are a linear pair, so they are supplementary. The measures of angles 1 and 4 add to 180 by the definition of supplementary angles. The measures of angles 3 and 4 add to 180 by the definition of supplementary angles. The sum of the measures of angles 1 and 4 equals the sum of the measures of angles 3 and 4 by substitution. m<1 = m<3 by the subtraction property of equality
anonymous
  • anonymous
how is it C http://hotmath.com/hotmath_help/topics/vertical-angles-theorem.html this looks close to the answer im not sure just wondering @mathstudent55

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