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(2x+20)+(3x+10)=180°
2x+3x+20+30=180°
5x+50=180°
5x=180°-50°
5x=130
x=130:5
x=26
A=2x+20
A=2(26)+20
A=52+20
A=72
KALAU ga salah ya..
(2x+20) + (3x+10) = 90
5x + 30 = 90
5x = 60
X = 12
A = 2x + 20
A = 2 (12) + 20
A = 24 + 20 = 44*
Maaf ga ada tanda derajat hehe