Use a protractor.
to measure a shape
An angle in a four sided shape can have any measure in the interval (0, 360) degrees except 180 degrees.
The measure of an exterior angle depends on the shape.
A right angle triangle.
|\ |_\ right-angled triangle
A square, rectangle, right angled triangle, room
Not necessarily. But a regular triangle must be acute angled.
Octagon
Yes
A shape in which all angles measure equally is equiangular. Have a good day! :)
It all matters what the inside angles measure up to. If the inside angles measure up to 360 degrees, the shape will tile. If the inside angles do not add up to 360 degrees, the shape won't tile.
The interior angles of a 24 sided shape add up to 3960 degrees