Vertically apposite angle, are (a +30°
and (b+20°) Such that a and be form
a linear fair and are vertically
opposite
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a+30 and b+20 are vertically opposite angles,
Therefore, a+30 = b+20
a=b+20-30
a=b-10
They form a linear pair, therefore
a+30+b+20=180°
Substituting the value of a,
b-10+30+b+20=180
2b+40=180
b+20=90
b=70
a=b-10=70-10 = 60
a=60° and b=70°
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