Angles
An angle with a measure between 0° and 90° is what kind of angle?
acute
What do we call a line segment with endpoints on a circle?
chord
What do we call the side opposite the right angle in a right triangle?
hypotenuse
What do we call the endpoint of a side of a polygon?
vertex
What do we call the union of two non-coplanar half-planes and their common edge?
dihedral angle
An angle that measures 90° is what kind of angle?
right angle
What is defined as the ratio between the circumference and the diameter of a circle?
pi
What is the sum of the measures of the angles of a pentagon?
540°
What do we call a line segment that has vertices of a polygon for endpoints but that is not a side of the polygon?
diagonal
What do we call the intersection of two disjoint sets?
empty set
An angle measuring 180° is what kind of angle?
straight angle
In how many points does a secant line intersect a circle?
2
Define isosceles triangle.
A triangle with 2 congruent sides.
What do we call sum of the lengths of the sides of a polygon?
perimeter
Congruent polygons have the same _______ and ________.
size and shape
An angle measuring between 90° and 180° is what kind of angle?
obtuse
If a minor arc measures 70°, then what is the measure of the corresponding major arc?
290°
In ΔXYZ, if XY = 5, XZ = 8, and YZ = 4, then which is the largest angle.
Angle Y
What do we call the parallel sides of a trapezoid?
bases
In similar polygons the sides are _________.
proportional