Definitions
A location that has no size, and is represented by a dot.
What is a point?
Identifying a case that makes the definition false.
What is a counter example?
A triangle with all angles are less than 90 degrees.
What is an acute triangle?
A transformation that preserves size and shape.
What is a rigid transformation?
Four ways we can prove triangles congruent.
What is SSS, SAS, ASA, AAS?
A straight continuous arrangement of many points having infinite length but no thickness
What is a line?
An angle that measures 90 degrees.
What is a right angle?
A triangle that has one angle larger than 90 degrees.
What is an obtuse triangle?
A transformation that changes the size of the pre-image by an enlargement or reduction.
What is a dilation?
Three ways we can prove triangles similar.
What is a AA, SSS, and SAS similarity criterion?
A flat surface that extends infinitely along its length and width, but no thickness.
What is a plane?
An angle that measures less than 90 degrees.
What is an acute angle?
A triangle that has no sides the same length.
What is a scalene triangle?
A line of reflection that transforms (3,2) to (-2, -3)
What is y = -x?
A segment that joins the two midpoints of two sides of a triangle such that it is 1/2 the length of the third side.
What is a midsegment?
Identifies points on the same line.
What is a collinear?
An angle that measures more than 90 degrees.
What is an obtuse angle?
A triangle that has 2 sides the same length.
What is an isosceles triangle?
A rotation that transforms (3, 4) to (-4, 3)
What is a 90 degree rotation ccw about the origin OR 270 degrees cw?
The triangle inequality theorem.
What is the sum of the lengths of any two sides of a triangle is greater than the length of the third side.
Identifies points on the same plane.
What is a coplanar?
A pair of angles that share a vertex and a common side whose non-common sides form a line.
What are linear pairs?
A triangle with all angles equal.
What is an equiangular triangle?
A rotation of 120, 240 and 360 degrees around the center of this polygon will map onto itself.
What is a regular triangle?
3 or more lines that intersect in the same spot.
What is concurrent?