It could be the shape of a triangle because its 3 interior angles add up to 180 degrees
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No shape does. If a shape has four angles, the sum of the four angles is 360°. If two are right angles, their sum is 2 x 90° = 180°, leaving 360° - 180° = 180° for the two remaining angles. An acute angle is less than 90°, so the sum of two acute angles is less than 90° + 90° = 180°, but in this shape their sum must be equal to 180°; thus no shape can exist. If one angle is acute and the other is obtuse, then their sum can be 180° and the shape is a trapezium.
triangle
A circle.
900 degrees. (n-2)*180 = (7 - 2) * 180 = 5 * 180 = 900
180