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anonymous
 one year ago
To find m<C I added 5x+9 + 7x + 3 = 90. Does this make sense..?
anonymous
 one year ago
To find m<C I added 5x+9 + 7x + 3 = 90. Does this make sense..?

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arindameducationusc
 one year ago
Best ResponseYou've already chosen the best response.1Its only 5x+9=7x+3 , Thats it! and find x

iGreen
 one year ago
Best ResponseYou've already chosen the best response.0Well.. m<C = m<D since this is an isosceles tirangle.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0so then I plug 6 into (7x+ 3) ?

phi
 one year ago
Best ResponseYou've already chosen the best response.0Here 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
 one year ago
Best ResponseYou've already chosen the best response.0you 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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