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An equilateral triangle

has three equal sides and

three equal angles. All

three internal angles are

also congruent to each

other. Each angle is 60°.

A square is a two-

dimensional shape

consisting of four equal

sides and four right angles.

Each interiof angle is 90°.

A regular pentagon is a

closed shape with equal

five sides and five angles.

Each interior angle is

108°.

A regular hexagon is a

closed shape with six

equal sides and six equal

angles. Each interior

angle measures 120°.

A regular heptagon has

seven equal sides and

seven equal angles. Each

interior angle measures

128.57°.

A regular octagon has

eight equal sides and

eight equal angles. Each

interior angle measures

135°.

A regular nonagon has

nine equal sides and nine

equal angles. Each

interior angle measures

140°. The sum of all

angles of a nonagon is

1,260°.

A regular

decagon has ten

equal sides and

ten equal angles.

Each interior

angle measures

144°. The sum of

all angles of a

decagon is

1,440°.

A regular

hendecagon has

eleven equal sides

and eleven equal

angles. Each

interior angle

measures

147.272°. The

sum of all angles

of a hendecagon

is 1,620°.

A regular

dodecagon has

twelve equal

sides and twelve

equal angles.

Each interior

angle measures

150°. The sum of

all angles of a

dodecagon is

1,800°.

A regular

tridecagon has

thirteen equal

sides and

thirteen equal

angles. Each

interior angle

measures

152.307°. The

sum of all angles

of a tridecagon is

1,980°.

A regular

tetradecagon

has fourteen

equal sides and

fourteen equal

angles. Each

interior angle

measures

154.285°. The

sum of all angles

of a tetradecagon

is 2,160°.

A regular

pentadecagon

has fifteen equal

sides and fifteen

equal angles.

Each interior

angle measures

156°. The sum of

all angles of a

pentadecagon is

2,340°.

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