Another word for "all the way around, arc-lengthwise"

Circumference

Step-by-step explanation:

Circumferences are flat geometric figures usually represented by “perfectly round” figures, but the geometric representation is nothing more than the representation of an algebraic formula. Circumferences are defined based on sets of points and their geometric representations are based on these definitions.

Another way to refer to circumferences is to use the terms "all the way around, arc-lengthwise". The important thing to remember is that the circumference is a geometric figure belonging to the plane that is made up of all points equally distant from a fixed point of that plane.

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation: