900°
The formula for the sum of the angles of an n-sided figure is (n-2)x180°.
For a 7 sided shape this would be (7-2)x180° = 5*180° = 900°
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The interior angles would ad to (9 - 2)*180 = 7*180 = 1260 degrees.
A quadrangle is any 4 sided shape and 360 degrees in a square.
Consider the trapezium (or trapezoid) ABCD such that AD is parallel to BC.Then angles DAB and ABC are consecutive interior angles (or co-interior angles) and sum to 180 deg.Similarly, angles ADC and DCB sum to 180 deg.Therefore, the sum of all four is 180 + 180 = 360 deg.
measure the sides then ad them together
The 3 interior angles of any triangle add up to 180 degrees because of the formula: (3-2)*180 = 180 degrees