|Teach Math Interactive||
How do you know what the interior angles measure of each of the polygons?
Count the number of angles (a triangle has three angles)
Subtract 2 (3-2 = 1)
multiply by 180 degrees (1 x 180)
That gives you the measure of the interior angles for the polygon.
Try this with the rest of your shapes
The formula is
n - 2 times 180
n-2 * 180
Triangle = 180 degrees
Quadrilateral = 360 degrees
Pentagon = 540 degrees
Hexagon = 720 degrees
Heptagon = 900 degrees
Octagon = 1,080 degrees
Nonagon = 1,260 degrees
Decagon = 1,440 degrees
A 3-sided polygon (a flat shape with straight sides).
A triangle has three sides and three angles.
The three angles always add to 180°
Any four-sided shape is a Quadrilateral.