How many triangles can be formed in a decagon your answer?

There are eight triangles in a regular decagon.

How many diagonals does a decagon have?

35 diagonals
A decagon has (10 2) – 10 = 35 diagonals. Each pair of opposing sides has three diagonals which are parallel to them, so 5*3 = 15 of the diagonals are parallel to a side.

How many triangles are in a Nonagon?

A regular nonagon has up to 9 congruent triangles that do not overlap. A nonagon is a type of polygon made up of 9 line segments.

How many angles does a decagon have?

ten angles
In geometry, a decagon (from the Greek δέκα déka and γωνία gonía, “ten angles”) is a ten-sided polygon or 10-gon. The total sum of the interior angles of a simple decagon is 1440°….Decagon.

Regular decagon
Coxeter–Dynkin diagrams
Symmetry group	Dihedral (D10), order 2×10
Internal angle (degrees)	144°

How many vertices does a decagon have?

10
Decagon/Number of vertices

How many sides has a heptagon?

seven
In geometry, a heptagon or septagon is a seven-sided polygon or 7-gon.

What is irregular decagon?

A decagon is defined as a polygon with ten sides. The word “deca” itself means “ten”. A decagon has 10 sides and 10 internal angles. It has ten vertices as well. Decagons may be irregular or regular -.

What is a convex decagon?

Lesson Summary A polygon is a closed, 2-dimensional shape with straight sides. A decagon is a 10-sided polygon. A regular decagon has congruent sides and angles. An irregular decagon has sides and angles that are not all congruent. A convex decagon has angles that are all smaller than 180 degrees.

What is an example of a decagon?

Historical Examples of decagon The plan of the church was a decagon, within which six composite columns in the centre supported six semi-circular vaults. Decagon, dek′a-gon, n. a plane figure of ten angles and sides. In the fourth are six triangles, in the fifth, five polygons from a pentagon to a decagon.