<A + <B + <C =180°
2x + x+15 +3x=180°
6x+15=180
6x=180-15
6x=165
x=165/6
<A=2x
=2×165/6
=165/3
=55°
A+B+C= 180°
2X+(X+15°)+3X=180°
2X+X+3X=180-15
6X=165
X=165:6
X=27.5
2X=2(27.5)=55
jawabannya A
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<A + <B + <C =180°
2x + x+15 +3x=180°
6x+15=180
6x=180-15
6x=165
x=165/6
<A=2x
=2×165/6
=165/3
=55°
A+B+C= 180°
2X+(X+15°)+3X=180°
2X+X+3X=180-15
6X=165
X=165:6
X=27.5
2X=2(27.5)=55
jawabannya A