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(i)
180=70+2a+3a
180=70+5a
5a=180-70
5a=110
a=110:5
a=22
sudut kedua
=2a
=2x22
=44
sudut ketiga
=3a
=3x22
=66
(ii)
180=57+b+33
180=90+b
b=180-90
b=90
sudut kedua
=b
=90
(iii)
180=4c+45+5c
180=9c+45
9c=180-45
9c=135
c=135:9
c=15
sudut pertama
=4c
=4x15
=60
sudut ketiga
=5c
=5x12
=60
(iv)
180=3d+7d+2d
180=12d
12d=180
d=180:12
d=15
sudut pertama
=3d
=3x15
=4s
sudut kedua
=7d
=7x15
=105
sudut ketiga
=2d
=2x15
=30
(v)
180=3c+40+4c
180=7c+40
7c=180-40
7c=140
c=140:7
c=20
sudut pertama
=3c
=3x20
=60
sudut ketiga
=4c
=4x20
=80
(vi)
180=f+f+f
180=3f
3f=180
f=180:3
f=60
sudut pertama
=f
=60
sudut kedua
=f
=60
sudut ketiga
=f
=60
(vii)
180=4g+g+g
180=6g
6g=180
g=180:6
g=30
sudut pertama
=4g
=4x30
=120
sudut kedua
=g
=30
sudut ketiga
=g
=30