anonymous
  • anonymous
Help please ! What is the measure of angle GCD? 116º 73º 29º 123º
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
ganeshie8
  • ganeshie8
start wid finding y
anonymous
  • anonymous
am guessing you meant X ? do i do 2x times 3x+2

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anonymous
  • anonymous
The sum of all the angle sin the pentagon is 540. so, 4y+4y+(3y+11)+103+(4y-9)=540. solve for y to get the measure of y in degrees. since EDH is a straight line. find the measure of angleCDH. and then angle DCG can be found.
anonymous
  • anonymous
i dont get it at all
anonymous
  • anonymous
i got 29 for y
anonymous
  • anonymous
am not sure what to do afer i got y
ganeshie8
  • ganeshie8
check again, y = 29 is wrong
ganeshie8
  • ganeshie8
actually i am wrong, y = 29 is correct
anonymous
  • anonymous
hahaha lol i dont know what to do after that though
ganeshie8
  • ganeshie8
Next, find \(\angle EDC\)
anonymous
  • anonymous
how??
anonymous
  • anonymous
214?
ganeshie8
  • ganeshie8
EDC = 4y - 9 = 4(29) - 9 = 107
anonymous
  • anonymous
ohhhhhh i doubled it i though it was marking half stupid mistake ? :/ now i dont know what to do wit that number
ganeshie8
  • ganeshie8
look at the pic
ganeshie8
  • ganeshie8
CDH and EDC are forming a straight line, eh ?
anonymous
  • anonymous
yeah
ganeshie8
  • ganeshie8
Find CDH
anonymous
  • anonymous
they care the same aren't they?
ganeshie8
  • ganeshie8
nope, they add up to 180
ganeshie8
  • ganeshie8
CDH + 107 = 180
anonymous
  • anonymous
83 :)
anonymous
  • anonymous
73*
ganeshie8
  • ganeshie8
yes
ganeshie8
  • ganeshie8
CDH = 73
ganeshie8
  • ganeshie8
Now the last step
ganeshie8
  • ganeshie8
look at the right quadrilateral, how many angles u knw in it ?
anonymous
  • anonymous
1 the 74 right ?
ganeshie8
  • ganeshie8
just now we found CDH
ganeshie8
  • ganeshie8
and the H has a little square.
anonymous
  • anonymous
90
ganeshie8
  • ganeshie8
dont ignore a little square
ganeshie8
  • ganeshie8
yea 90.
anonymous
  • anonymous
123 :D
ganeshie8
  • ganeshie8
so, we knw 3 angles in it already. can we find GCD ?
anonymous
  • anonymous
i believe so i just did 360 -74-73-90
ganeshie8
  • ganeshie8
Excellent ! 123 is correct !!
anonymous
  • anonymous
ca you help me with one more these are the most confusing things i have ever seen in geometry
anonymous
  • anonymous
ganeshie8
  • ganeshie8
this is going to be easy :p
ganeshie8
  • ganeshie8
use this : sum of exterior angles in a polygon add up to 360

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