anonymous
  • anonymous
To find m
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
1 Attachment
arindameducationusc
  • arindameducationusc
No no
arindameducationusc
  • arindameducationusc
Its only 5x+9=7x+3 , Thats it! and find x

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iGreen
  • iGreen
Well.. m
iGreen
  • iGreen
triangle*
iGreen
  • iGreen
^
anonymous
  • anonymous
so then I plug 6 into (7x+ 3) ?
Nnesha
  • Nnesha
why 6 ? x= ??
phi
  • phi
Here is what you should notice: 1) the triangle is isosceles (two sides are equal... notice the red "hash marks") 2) then you should remember that the altitude (line from A to B) divides the angle at A into two equal parts (bisects the angle) (I remember this because it looks like it divides the angle in half... (not a proof) but it jogs my memory that it does) once you figure out the two angles are equal, you write down that the angles equal each other.
phi
  • phi
you write down 7x+3 = 5x+9 once you get to this stage, you do algebra. to find 2x= 6 x= 3 that means 1/2 of angle A is 7*3+3 (or 5*3+9) or 24 degrees now you can find angle C using sum of angles in a triangle is 180 24+90 + C = 180

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