Lines
A series of points that extends in opposite directions without end.
What is a line?
Two opposite angles formed by intersecting lines.
What are vertical angles?
A triangle whose angles each measure less than 90 degrees.
What is an acute triangle?
A polygon with four sides.
What is a quadrilateral?
What is a vertex?
the intersection point of two sides of a plane figure
A flat surface with no thickness. It extends in all directions with no end.
What is a plane?
Two angles that share a vertex and a common side (they are next to each other.)
What are adjacent angles?
A triangle with one angle that measures more than 90 degrees.
What is an obtuse triangle?
How many sides does a hexagon have?
What is 6?
coplanar
lying in the same plane
a. A section that has two endpoints. b. A section that has one endpoint.
a.What is a line segment? b. What is a ray?
Pairs of angles which lie on the same side of a transversal and are in the 'same position'.
What are corresponding angles?
A triangle with no congruent sides.
What is a scalene triangle?
How many degrees are in a triangle?
180
Angle bisector
ray that divides an angle into two congruent adjacent angles.
Two lines that lie in the same plane and do not intersect.
What are parallel lines?
a. Two angles whose sum is 90 degrees. b. Two angles whose sum is 180 degrees.
a. What are complementary angles? b. What are supplementary angles?
A triangle whose sides are all congruent.
What is an equilateral triangle?
How many degrees do the interior angles of an octagon add to?
What is 1080?
Isosceles triangle
A triangle with two equal sides.
a. Lines that do not lie in the same plane and do not intersect. b. Lines that intersect at right angles.
a. What are skew lines? b. What are perpendicular lines?
a. A pair of angles which lie on opposite sides of the transversal on the interior of a pair of lines. b. A pair of angles which lie on opposite sides of the transversal on the exterior of a pair of lines.
a. What are alternate interior angles? b. What are alternate exterior angles?
A triangle with at least two congruent sides.
What is an isosceles triangle?
What is the measure of EACH angle of a regular heptagon?
What is 150 degrees?
Geometry
teacher evaluates sketch
The study of geometric figures in two dimensions (plane geometry) and three dimensions (solid geometry). It includes the study of points, lines, triangles, quadrilaterals, other polygons, circles, spheres, prisms, pyramids, cones, cylinders, and polyhedra. Geometry typically includes the study of axioms, theorems, and two-column proofs.
Among the various types of geometry are analytic geometry, Euclidean geometry, and non-Euclidean geometry.