How many total diagonals does an undecagon have?
Hint
We're looking for the total number of diagonals in an 11-sided figure.
Answer
44
How many distinct triangles can a 44-sided polygon be divided into?
An n-gon can be split into n – 2 triangles.
42
What is the sum of the internal angles of this polygon?
How many sides does the polygon have? How many distinct triangles could we make?
900°
What would be the measure of a single interior angle in a regular 15-gon?
Regular polygons are equilateral and equiangular. The latter is most important in this case.
156°
Which polygons are regular?
What is required of a regular polygon?
(A) and (B) are regular, but (C) is not
What is the perimeter of the polygon shown?
We break the polygon down into triangles and quadrilaterals.
50 units
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