syjiaxuan's answer to Phil's Secondary 4 E Maths Singapore question.
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Hope this helps, impt parts in pink !
Date Posted:
4 years ago
I presume using exterior angles would be easier.
With an increase of 7 sides, the exterior angle decreases by 21 degrees. Let exterior be called x.
nx = 360
(n + 7)(x - 21) = 360
Simultaneous approach.
With an increase of 7 sides, the exterior angle decreases by 21 degrees. Let exterior be called x.
nx = 360
(n + 7)(x - 21) = 360
Simultaneous approach.
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