## How do you find the interior angle of a regular decagon?

The sum of the measures of the interior angles of a decagon (10 sided polygon) is 1,440. We found this by using the formula (n-2)(180). Thus, to find the measure of each interior angle we simply divide the sum by the number of total sides in the polygon. 1,440/10 = 144.

1440 degrees

## What is the interior angle of a regular 18 sided polygon?

Regular Polygons

Sides Name Interior Angles
18 Octdecagon 160.00°
20 Icosagon 162.00°
30 Triacontagon 168.00°

## What is the interior angle of a regular?

All the interior angles in a regular polygon are equal. The formula for calculating the size of an interior angle is: interior angle of a polygon = sum of interior angles ÷ number of sides. The sum of exterior angles of a polygon is 360°.

## What is the formula for interior angles?

An interior angle is located within the boundary of a polygon. The sum of all of the interior angles can be found using the formula S = (n – 2)*180. It is also possible to calculate the measure of each angle if the polygon is regular by dividing the sum by the number of sides.

108°

720°

900°

## What is the sum of the interior angles of a 21 Gon?

Explanation : Sum of the measures of the interior angles of a polygon of n sides is (n−2)×180∘ .

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heptacontagon

3240 degrees

## How many interior angles does an 18 gon have?

In geometry, an octadecagon (or octakaidecagon) or 18 – gon is an eighteen – sided polygon . Octadecagon.

Symmetry group Dihedral (D 18 ), order 2× 18
Internal angle (degrees) 160°
Dual polygon Self
Properties Convex, cyclic, equilateral, isogonal, isotoxal

180°

## What is an interior angle of a triangle?

60° (for equilateral)

## What does interior angle mean?

1 : the inner of the two angles formed where two sides of a polygon come together. 2 : any of the four angles formed in the area between a pair of parallel lines when a third line cuts them.

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#### How do you find the measure of an interior angle

How do you find the measure of each interior angle? The formula for calculating the size of an interior angle is: interior angle of a polygon = sum of interior angles ÷ number of sides. The sum of exterior angles of a polygon is 360°. The formula for calculating the size of an exterior angle […]