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anonymous

  • one year ago

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

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  1. anonymous
    • one year ago
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  2. arindameducationusc
    • one year ago
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    No no

  3. arindameducationusc
    • one year ago
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    Its only 5x+9=7x+3 , Thats it! and find x

  4. iGreen
    • one year ago
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    Well.. m<C = m<D since this is an isosceles tirangle.

  5. iGreen
    • one year ago
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    triangle*

  6. iGreen
    • one year ago
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    ^

  7. anonymous
    • one year ago
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    so then I plug 6 into (7x+ 3) ?

  8. Nnesha
    • one year ago
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    why 6 ? x= ??

  9. phi
    • one year ago
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    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.

  10. phi
    • one year ago
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    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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