Complete the following proof. ?

Question

http://i33.tinypic.com/34pete9.gif

Given:<4 is an exterior angle of the triangle

Prove: m<4= m<1+m<2

http://i36.tinypic.com/24g3ouh.gif

Answer 1

(a) angle addition postulate

(b) definition of linear pair

(c) supplementary angles

(d) substitution

(e) subtraction

:)

hope this helps

Answer 2

Do you really need all that many statements for the proof?

&lt;3 supplements &lt;4 given

&lt;1+&lt;2+&lt;3=180 triangle prop

&lt;3+&lt;4=180  supplement prop

Then &lt;1+&lt;2=&lt;4 qed