a tetradecagon is a polygon with 14 sides. Deca = 10, and tetra = 4.
The formula for the internal angle for a polygon is 180 * (n - 2) / n, where n is the number of sides on the polygon.
You should be able to figure out the rest from there!
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A tetradecagon has 14 sides.
The sum of the internal angles of any triangle is 180 degrees. Any rectangle has four 90 degree internal angles, totalling 360 degrees.
A quadrilateral shape has four sides and four internal angles. A triangle has three sides and three internal angles. Therefore there is no such thing as a quadrilateral triangle.
The internal angles add up to 360 degrees. If the trapezium has its base parallel to the top then the internal angles on the left of the parallel lines add to 180 degrees, the angles on the right add to 180 degrees.
The external angles will. The internal angles will equal 540o.