Principles
sums
acute
A triangle with one right angle.
right triangle
Two angles whose sum is 90 degrees.
complementary
A plane figure bounded by straight lines is called a _________.
polygon
The whole is equal to the ______ of the parts
sum
An angle greater than 90 degrees and less than 180 degrees.
obtuse
A triangle with one obtuse angle.
obtuse triangle
Two angles whose sum is 180 degrees.
supplementary
The angle bisectors of the interior angles of polygon meet a point called the ________ of the polygon.
center
The whole is __________ than any of its parts.
greater
And angle whose sides form one straight line extending through the vertex.
straight angle
A triangle with all angles equal.
equiangular
When two straight lines intersect they create a set of _________ angles (they share a common vertex only)
vertical
A polygon in which each of the interior angles are less than 180 degrees is called _________
convex
If a is greater than b and b is greater than c then ____________.
a is greater than c
reflex angle
A triangle with two sides equal.
isosceles
Consecutive angles share a common _________.
side
A polygon with at least one interior angle greater than 180 degrees is called ________
concave
If equals are subtracted from equals the _______ are equal.
remainders
When one straight line meets another so as to make two equal adjacent angles, each angle is called a _________ angle.
right
A triangle with no sides equal.
scalene
What do adjacent angles have in common?
common side and common vertex
The intersection of the sides of a polygon are called _________.
vertices