example (4) explain the step underlined with question mark?
see the second page
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angle 1 = angle 6
so,,,,angle 1 + angle 6 = angle 1 + angle 1
=2 angle 1
and so on....
and,,,, (angle 1 + angle 2 + angle 3 ) makes a straight line so sum of these angle will be 180
so,,,,angle 1 + angle 6 = angle 1 + angle 1
=2 angle 1
and so on....
and,,,, (angle 1 + angle 2 + angle 3 ) makes a straight line so sum of these angle will be 180
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