An angle that has a measure that is less than 90 degrees°
A triangle that has 3 acute angles.
Two angles that share a vertex, share one side, and whose interiors do not overlap.
A segment in a triangle that is drawn from a vertex to the opposite side creating a right angle. The altitude is also known as the height of the triangle.
Two rays that share an endpoint
A ray that cuts an angle in half.
The distance from the center to the side of a regular polygon. The apothem always creates a right angle with the side of the polygon.
The number of square units that are contained within a 2 dimensional shape.
The two parallel sides in a trapezoid
The non-congruent side in an isosceles triangle
to cut an object in half
An angle in a circle or a regular polygon that has the center as its vertex and each side of the angle is a radius
a segment in a circle whose endpoints are on the circle.
The point in a triangle where all three medians of the triangle meet. The centroid is the balance point of any triangle.
a set of points that are equidistant from a center point
distance around circle
The point where half of the edges in a pyramid meet.
Two angles whose measures add up to 90°.
A polygon where at least one diagonal falls outside of the polygon. A polygon that has at least one interior angle that is larger than 180°.
Two objects that have the same size and same shape.
Two angles that share a side but not a vertex and their interiors DO overlap.
A polygon where all of the diagonals lie inside of the polygon. Every interior angle in a convex polygon will be less than 180°.
A trigonometric function that is a ratio of the adjacent side to the hypotenuse in a right triangle.
A polygon with 10 sides.
A chord that passes through the center of a circle.
A polygon with 12 sides.
A polygon with all angles congruent.
A polygon with all sides congruent.
A polygon with 7 sides.
A polygon with 6 sides.
The longest side of a right triangle. It is always located across from the right angle.
An angle in a circle whose vertex is on the circle and each side is a chord.
A triangle that has two sides congruent.
A quadrilateral that has two pairs of consecutive sides and one pair of opposite angles congruent.
1. The congruent sides of an isosceles triangle.
2. The two sides of a right triangle that are not the hypotenuse.
3. The non-parallel sides of a trapezoid. When the trapezoid is isosceles, the legs will be the ones congruent.
Two adjacent angles whose non-common sides form a line.
A piece of a circle that measures between 180° and 360°.
The average of a set of data.
1. The middle value of a set of data.
2. A segment in a triangle that connects a vertex to the midpoint of the opposite side.
A point that divides a segment in half. A segment bisector.
1. In a triangle, it connects two midpoints of any two sides.
2. In a trapezoid, it connects the midpoints of the legs.
A piece of a circle that measures less than 180°.
The element in a set of data that occurs the most often.
A polygon with 9 sides.
An angle that has a measure between 90 and 180 degrees.
A triangle that has one obtuse angle and two acute angles.
A polygon with 8 sides.
Two lines that never intersect and lie in the same plane. (same direction)
A quadrilateral whose opposite sides are parallel.
A polygon with 5 sides.
The distance around a polygon.
Two lines that create right angles when they intersect.
A set of points that creates a flat surface.
Point of Tangency
The point where a tangent intersects a circle.
A 3 dimensional figure that has polygons for faces. A polyhedron has no curves.
A polyhedron that has two bases and rectangles as lateral faces.
A tool that is used to measure angles.
A polyhedron that has one base and triangles for lateral faces.
A polygon with 4 sides.
A segment in a circle whose endpoints are the center and any point on the circle.
Part of a line that has only one endpoint. It goes on forever in one direction.
The right side of a two - column proof. These are explanations for each step of the proof.
An equiangular quadrilateral.
A polygon that is equiangular and equilateral.
A polyhedron that has congruent regular polygons as faces. There are only 5 regular polyhedrons that exist. These are also known as the Platonic Solids.
An equilateral quadrilateral.
An angle that measures exactly 90°.
A triangle that has one right angle and two acute angles.
A triangle that has 3 different side lengths.
A line that intersects a circle in exactly two places.
Part of a line that has two endpoints.
A piece of a circle that measures exactly 180°.
Two objects that have the same shape but different sizes.
A trigonometric function that is a ratio of the opposite side to the hypotenuse in a right triangle.
Two lines that will never intersect but are in different planes. (Different directions.)
In a pyramid, the distance from the common vertex to the midpoint of an edge of the base.
A regular quadrilateral.
The left side of a two - column proof. These are the steps to proof the given statement.
An angle that measures exactly 180°.
Two angles whose measures add up to 180°.
The total area of all the faces of a solid figure.
1. A trigonometric function that is the ratio of the opposite side to the adjacent side in a right triangle.
2. A line that intersects a circle at exactly one point.
A quadrilateral that has exactly one pair of parallel sides.
The point where two sides of an angle meet.
The amount of space inside a 3 dimensional object.