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Given: ∠4 is an exterior angle of ΔABC . Prove: m∠1 + m∠2 = m∠4 
Picture: https://s.yimg.com/tr/i/4516dabcf9a74411afddd9977b5028ee_A.png
Statements: 
1. ∠4 is an exterior angle of ABC 
2. ∠3 and ∠4 form a linear pair 
3. ∠3 is supplementary to ∠4 
4. m∠3 + m∠4 = 180* 
5. ? (my answer: m∠1 + m∠2 +m∠3 = 180*) 
6. m∠1 + m∠2 + m∠3 = m∠3 + m∠4 
7. ? (My answer: m∠1 + m∠2 =m∠4) 

Reason: 
1. ? (my answer: Given) 
2. ? 
3. ? 
4. ? (My answer: Linear pair) 
5. Triangle Sum Theorem 
6. ? (my answer: Substitution) 
7. ? (my answer: either subtractive of addition property of equality) 

Sorry if this a lot but I'm really struggling with geometry and would like it if someone could help. Please help me.

Guest Nov 17, 2017
 #1
avatar+88980 
+1

2. A line standing on a line forms a linear pair

3. Linear Pair Theorem

4. Definition of Supplementary

 

 

5 ,6 look good

 

7 Subtraction Property  of Equality

 

 

cool cool cool

CPhill  Nov 17, 2017

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