Christmas MT's answer to Siti Jamaaini's Primary 1 Maths question.
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I'm confused as to why you could make all the scribbling in pencil but not able to calculate x.
You know that an angle in a regular pentagon is 108, which means you know the polygon angle formula. You know that the other angle is 72 because of interior angles between 2 parallel lines.
All that is left is actually just using 360 - 120 - 72 - 108 = 60 (using the polygon angle formula), then using 108 - 60 = 48. x = 48.
Also, this is P1 math??
You know that an angle in a regular pentagon is 108, which means you know the polygon angle formula. You know that the other angle is 72 because of interior angles between 2 parallel lines.
All that is left is actually just using 360 - 120 - 72 - 108 = 60 (using the polygon angle formula), then using 108 - 60 = 48. x = 48.
Also, this is P1 math??
Date Posted:
7 years ago
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