3 years ago

Please help 20 points

1 answer:

3 0

Four angles must add up to 360.

∠A+∠B+∠C+∠D=360 (5/2x+30)+(7/2x+40)+(9/2x+10)+(5/2x+20)=360 26/2x + 100 = 360 13x = 260 x = 20. To solve for ∠C, plug x back in: ∠C = 9/2x+10 = 9/2*20+10 = 100

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