Mathematics
8 Online
OpenStudy (anonymous):
In the accompanying diagram of parallelogram ABCD m
Join the QuestionCove community and study together with friends!
Sign Up
jimthompson5910 (jim_thompson5910):
The adjacent angles of any parallelogram are supplementary
jimthompson5910 (jim_thompson5910):
So
m < A + m < B = 180
2x + 15 + x = 180
OpenStudy (anonymous):
Trudat.
OpenStudy (anonymous):
Would you like me to draw the diagram thats on my paper?
OpenStudy (anonymous):
For art practice, yes.
Join the QuestionCove community and study together with friends!
Sign Up
jimthompson5910 (jim_thompson5910):
these angles here are adjacent angles
|dw:1365277401968:dw|
jimthompson5910 (jim_thompson5910):
So if they were angles A and B, then they would add to 180 degrees
OpenStudy (anonymous):
hold on, ill show you whats on my paper
jimthompson5910 (jim_thompson5910):
alright, but I think the idea still applies (no matter how your drawing is)
OpenStudy (anonymous):
nvm. So is this what I write on my paper?
m < A + m < B = 180
2x + 15 + x = 180
Join the QuestionCove community and study together with friends!
Sign Up
jimthompson5910 (jim_thompson5910):
yes and keep going to solve for x
jimthompson5910 (jim_thompson5910):
once you find x, use it to find m < A
OpenStudy (anonymous):
so you subtract 15 from 180?
jimthompson5910 (jim_thompson5910):
yes
jimthompson5910 (jim_thompson5910):
giving you what?
Join the QuestionCove community and study together with friends!
Sign Up
OpenStudy (anonymous):
2x+x=165
OpenStudy (anonymous):
?
OpenStudy (anonymous):
Yes.
OpenStudy (anonymous):
Then do you subtract x?
jimthompson5910 (jim_thompson5910):
2x+x would turn into 3x
Join the QuestionCove community and study together with friends!
Sign Up
OpenStudy (anonymous):
like 2x-x?
jimthompson5910 (jim_thompson5910):
after you combine like terms
jimthompson5910 (jim_thompson5910):
so we know that
3x = 165
OpenStudy (anonymous):
You now have 2x+x=165
=> 3x = 165
x = 165/3
OpenStudy (anonymous):
so you divide by 3 n\and get 55?
Join the QuestionCove community and study together with friends!
Sign Up
jimthompson5910 (jim_thompson5910):
yep x = 55
OpenStudy (anonymous):
thanks!!!!(:
jimthompson5910 (jim_thompson5910):
now plug this into
m < A = 2x+15
jimthompson5910 (jim_thompson5910):
to find m < A, which is the measure of angle A
OpenStudy (anonymous):
so you get 125?
Join the QuestionCove community and study together with friends!
Sign Up
jimthompson5910 (jim_thompson5910):
good
OpenStudy (anonymous):
thanks, so thats the final answer?
jimthompson5910 (jim_thompson5910):
yes that's correct