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It has 20 vertices or angles.

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No! A dodecagon has 12 vertices. A polygon with 20 vertices is an icosagon.

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A dodecagon has 12 vertices and 12 angles.

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A dodecagon has 12 vertices and 12 angles.

Q: How many angles does a regular dodecagon have?

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A regular 12 sided dodecagon has 54 diagonals.

A regular or an irregular dodecagon both have 12 sides

Each exterior angle is 30 degrees and each interior angle is 150 degrees

Sum of exterior angles of an n-gon is 360 degrees. A dodecagon has 12 exterior angles which are all equal and so each is 360/12 = 30 degrees.

A 12 sided shape with equal sides and with equal interior and exterior angles

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A regular or even an irregular dodecagon is a 12 sided polygon whose interior angles add up to 1800 degrees

A dodecagon has 12 vertices.

The sum of the interior angles of a dodecagon is:sum = (12 - 2) x 180o= 1800oIn a regular dodecagon, each of the interior angles is 1800o ÷ 12 = 150o

It is regular if all its sides are equal AND all its angles are equal. Otherwise, it is not regular.

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The interior angles of a dodecagon sum to 1800 degrees.

The interior angles of a dodecagon sum to 1800 degrees.

By definition, a dodecagon has 12 sides and 12 internal angles

A regular or an irregular dodecagon both have 12 sides

A regular 12 sided dodecagon has 54 diagonals.

The interior angles of a dodecagon add up to 1800 degrees.

A dodecagon is a polygon that has twelve sides. A regular dodecagon has twelve internal angles of 150 degrees each.