T4 maths exterior sidesWatch
Can anyone explain this question. Answer is 15. Not sure what the question is asking.
If the polygon has 8 equal external sides, then it also has 8 equal external angles (i.e. the angles made between each of the external sides). So if the size of the external angle is , then we must have from which we can find .
In your case, you can find the external angle for the shape by geometry, but you need to find the number of sides , say. Can you finish this? You need to write down an equation similar to the one I gave above, then solve it.