The 8 interior angles of an octagon add up to 1080 degrees
The 8 interior angles of an 8 sided octagon add up to 1080 degrees
all inside angles of a hexagon add up to 720°
The three inside angles add up to 180 degrees.And so do the three outside angles.
1440
A triangle has 3 inside angles that add up to 180 degrees
All inside angles of a hexagon add up to 720°
The angles add up to 180 degrees on every triangle.
All of the angles inside of any 4-sided figure add up to 360 degrees.
180 degrees
The 4 interior right angles inside a square add up to 360 degrees
For all trapezoids, and indeed all quadrilaterals, the total of inside angles is 360°.