see the example no(4) second page underlined with question mark explain that step
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Here,
Angle 1 =angle6
3=4
2=5
If we add 3 in 3 the result would be the same as 2*3
Therefore
Angle 1 + angle 6= 2 angle 1
And similarly all others
Angle 1 =angle6
3=4
2=5
If we add 3 in 3 the result would be the same as 2*3
Therefore
Angle 1 + angle 6= 2 angle 1
And similarly all others
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