11
If you mean a regular 9 sided nonagon Total interior angles are (9-2)*180 = 1260 degrees Each interior angle is 1260/9 = 140 degrees
Area of plane figure
A 14 sided polygon has 14 angles. If this polygon is a regular polygon, then in order to find the sum of the angles we can use the formula, (n - 2)180°, where n is the number of the sides. (n - 2)180° = (14 - 2)180° = 2,160° Thus each angle will be approximately 154.29° (2,160°/14).
The surface area of a space figure is the total area of all the faces of the figure
9
30
15
15
This figure is a regular 12-sided polygon. Find m<4
30
11
9
This figure is a regular 12-sided polygon. Find m<4
8
To find the area, first divide the shape into regular, simple shapes. Then use formulas to find the area of the smaller, regular shapes. Lastly, add up all the smaller areas to find the area of the original shape.
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