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Q4. 12x+3x=180 {sum of angle made on straight line =180=theorem 23}
15x=180
x=180÷15
(x=12)
Q5. (z=84) ( vertically opposite angle=v.o.a)
2x+z=180 {theorem 23}
2x+84=180
2x=180-84
2x=96
x=96÷2
(x=48)
y+25=x{v.o.a}
y+25=48
y=48-25
(y=13)
15x=180
x=180÷15
(x=12)
Q5. (z=84) ( vertically opposite angle=v.o.a)
2x+z=180 {theorem 23}
2x+84=180
2x=180-84
2x=96
x=96÷2
(x=48)
y+25=x{v.o.a}
y+25=48
y=48-25
(y=13)
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