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<B = x +15
<C = x +5
<1 sudut dalam sebuah segitiga = 180
Maka,
<A +<B +<C = 180
2x +(x +15) +(x +5) = 180
4x +20 = 180
4x = 180 -20
4x = 160
x = 160/4
x = 40
Maka,
<C = x +5
= 40 +5
= 45
Itu jawabannya.
180=4x + 20
160=4x
40=x
c=x+5
=40+5=45 derajat