TERM | DEFINITION |
POINT | An exact location in space |
LINE | A straight arrangement of points that extends forever in opposite directions |
LINE SEGMENT | A part of a line that consists of two endpoints and all the point between |
RAY | A straight arrangement of points that extends forever in one direction |
PLANE | A flat surface that extends forever |
ANGLE | The figure formed when two rays share a common endpoint |
VERTEX | The point where two rays (or line segments) meet |
SIDES OF AN ANGLE | The rays that form an angle |
DEGREE | The unit commonly used to measure the size of an angle |
PROTRACTOR | A geometric tool used to measure an angle |
ACUTE ANGLE | An angle with the measure greater than 0° and less than 90° |
RIGHT ANGLE | An angle with the measure equal to 90° |
OBTUSE ANGLE | An angle with the measure greater than 90° and less than 180° |
STRAIGHT ANGLE | An angle with the measure equal to 180° |
PARALLEL LINES | Two lines in the same plane that do not intersect |
PERPENDICULAR LINES | Two lines that intersect to form right angles |
SKEW LINES | Two lines in different planes that do not intersect |
INTERSECTING LINES | Lines that meet or cross each other at one point |
VERTICAL ANGLES | When two lines intersect, the angles that are not next to each other |
CONGRUENT | Equal in measure |
ADJACENT ANGLES | When two lines intersect, the angles that are next to each other |
COMPLEMENTARY ANGLES | Two angles for which the sum of their measure is 90° |
SUPPLEMENTARY ANGLES | Angles for which the sum of their measure is 180° |
TRANSVERSAL | A line that intersects two parallel lines |
CORRESPONDING ANGLES | Angles that occupy the same relative position |
SCALENE TRIAGLE | A triangle in which no sides are the same length |
ISOSCELES TRIANGLE | A triangle in which two sides are the same length |
EQUILATERAL TRIANGLE | A triangle in which three sides are the same length |
ACUTE TRIANGLE | A triangle in which all angles are acute angles |
RIGHT TRIANGLE | A triangle in which one angle is a right angle |
OBTUSE TRIANGLE | A triangle in which one angle is an obtuse angle |
CIRCLE | A closed, curved shape in which all points on the circle are equal distance from the center |
TRIANGLE | A polygon with three sides |
QUADRILATERAL | A polygon with four sides |
PARALLELOGRAM | A quadrilateral with two pairs of parallel sides |
RECTANGLE | A quadrilateral with two pairs of parallel sides and four right angles |
RHOMBUS | A quadrilateral with two pairs of parallel sides and four sides of equal length |
SQUARE | A quadrilateral with two pairs of parallel sides, four right angles, and four sides of equal length |
TRAPEZOID | A quadrilateral with one pair of parallel sides |
PENTAGON | A polygon with five sides |
HEXAGON | A polygon with six sides |
HEPTAGON | A polygon with seven sides |
OCTAGON | A polygon with eight sides |
NONAGON | A polygon with nine sides |
DECAGON | A polygon with ten sides |