a point - A point is a location, or position. It has no size or shape and is defined by its only property: its position., line segment - A line segment consists of two endpoints and all the points between those endpoints. In the figure above, the line segment's two endpoints are A and B., a ray - A ray* has a single endpoint (also called its origin) and extends indefinitely in one direction. The ray's direction is described with the help of any other point on the ray., Lines - Lines continue infinitely in opposite directions. The fact that lines continue forever in opposite directions is what sets lines apart from line segments and rays., Straight Line aka straight angle - A straight line is also called a straight angle. The measure of an angle that lies on a straight line is 180°, a right angle - A 90° angle is called a right angle. Please note that a right angle is denoted by the symbol ⌝ between the two lines, as shown above. When you see this symbol, you can be confident you are seeing a right angle., 45° angle - The angle above is 45°. It is half of a 90° (or right) angle., Acute angles - Acute angles measure less than 90°., Right angle - Right angles measure exactly 90°, Obtuse angle - Obtuse angles measure greater than 90° , but less than 180°., Straight angle - Straight angles measure exactly 180°., Reflex angle - Reflex angles measure greater than 180°., Triangle interior angles - Triangles are polygons with three sides and three angles, and the sum of the interior angles of a triangle* is 180°., Isosceles triangle - Isosceles triangles have only 2 equal angles, Equilateral triangle - Equilateral triangles have three equal angles (each measuring 60°), Scalene triangle - scalene triangles have three angles of different sizes., triangle inequality theorem - The triangle inequality theorem* states that for every triangle, the sum of any two sides is always greater than the third side., Parallelograms - Quadrilaterals with opposite, parallel, equal sides and equal opposite angles. Diagonals bisect each other., Squares - Parallelograms with four equal sides and four 90° angles. Diagonals are congruent and perpendicular, and they bisect one another., Rectangles - Parallelograms with four right angles, equal opposite sides, and two sets of parallel opposite sides. Diagonals are congruent and bisect one another., Rhombuses - Parallelograms with four equal sides, equal opposite angles, and two sets of parallel opposite sides. Diagonals are perpendicular and bisect one another., Trapezoids - Quadrilaterals with one pair of parallel opposite sides. An isosceles trapezoid has congruent diagonals, but other trapezoids do not., Kite - Quadrilaterals with two sets of adjacent equal sides and one set of equal opposite angles. Diagonals are perpendicular., triangle inequality theorem - for every triangle, the sum of any two sides is always greater than the third side., Supplementary angles - Form a 180° angle, Complementary angles -  angles add up to 90°., Triangle Interior angles  - The sum of a triangle's interior angles are 180°, Quadrilateral Interior angles - The sum of a quadrilateral interior angles are 360°, Pentagon Interior angles - The sum of a pentagon's interior angles are 540°, Hexagon Interior angles - The sum of a hexagon's interior angles are 720°, Octagon Interior angles - The sum of an octagon's interior angles are 1,080°,

Lines, Line Segments, Rays, Angles, and Polygons

Print
Embed

Leaderboard

Flash cards is an open-ended template. It does not generate scores for a leaderboard.

Visual style

Options

Switch template

Continue editing: ?