J's answer to Angel's Secondary 1 Maths Singapore question.
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If the interior angle = 152.5°, then one exterior angle = 180° - 152.5° = 27.5°
Sum of exterior angles of any polygon = 360°
Number of exterior angles = 360° ÷ 27.5 = 13 1/11
The number of interior angles has to be a positive integer which is equal to or bigger than 3 (3,4,5,6,10,25, etc) . But we have obtained 13 1/11 from the working. So the calculation must be wrong since number of angles cannot be a mixed number.
Sum of exterior angles of any polygon = 360°
Number of exterior angles = 360° ÷ 27.5 = 13 1/11
The number of interior angles has to be a positive integer which is equal to or bigger than 3 (3,4,5,6,10,25, etc) . But we have obtained 13 1/11 from the working. So the calculation must be wrong since number of angles cannot be a mixed number.
Date Posted:
2 years ago
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