Angles and Lines
Define Parallel Lines
Two lines (in the same plane) that never intersect
What is a polygon called that has 5 sides?
Pentagon
What is a triangle called that has 3 acute angles.
Acute
What is a quadrilateral called that has both pairs of opposite sides parallel?
Parallelogram
What is the segment from the center of a circle to the edge of a circle called?
Radius
Define Perpendicular Lines
Two lines that intersect at a right angle
What do you call a polygon with all sides congruent?
Equilateral
What is an obtuse triangle?
A triangle with ONE obtuse angle
What is a quadrilateral called that has two pairs of consecutive sides congruent?
Kite
What is a minor arc?
A part of a circle that is less than half the circle.
What are complementary angles?
Two angles whose sum is is 90°
What is a polygon called where no diagonal falls outside of the polygon.
Convex
What is a triangle called that has 2 sides congruent?
Isosceles
What do you call a quadrilateral with one pair of opposite sides parallel?
Trapezoid
What is a tangent line?
A line that intersects a circle at one location
What is an Angle Bisector?
A ray that divides an angle into two congruent parts
What does it mean when two sides of a polygon are "consecutive"?
The sides are "next to" each other. They share a vertex.
What is a triangle called that has no congruent sides.
Scalene
What is a square?
A quadrilateral with 4 equal (right) angles and 4 sides congruent.
What is it mean if two circles are "concentric"?
They have the same center.
Give a counterexample to the statement: All acute angles are congruent.
Ex. 40° and 50° angles are both acute but not congruent.
What is a polygon called that has 12 sides?
Dodecagon
Fill in the blank: Base angles of an isosceles triangle are ____________.
Congruent
Always
What is a line called that intersects a circle twice?
Secant