Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
ihatealgebrasomuch
Group Title
Prove the exterior angles theorem:
Given: triangle ABC w/ exterior angle ACD
Prove: measure of angle ACD= measure of angle A +measure of angle B.
Please help! i dont know how to do this proof!
 2 years ago
 2 years ago
ihatealgebrasomuch Group Title
Prove the exterior angles theorem: Given: triangle ABC w/ exterior angle ACD Prove: measure of angle ACD= measure of angle A +measure of angle B. Please help! i dont know how to do this proof!
 2 years ago
 2 years ago

This Question is Closed

ihatealgebrasomuch Group TitleBest ResponseYou've already chosen the best response.0
dw:1350775162088:dw
 2 years ago

BTaylor Group TitleBest ResponseYou've already chosen the best response.1
if the sum of the angles is 180, then A + B + C = 180. Solving for C, you get C=180AB. For the exterior angle, angle DCA is supplementary to angle ACB. So, DCA + ACB = 180. SInce you know angle ACB (simplified to angle C in the first line), you can substitute that DCA+180AB=180. IF you simplify this, you get DCA=A+B
 2 years ago
See more questions >>>
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.