WGU D127 - Mathematics for Elementary Educators III

line - answer-A straight one-dimensional figure that extends infinitely in both directions. perpendicular - answer-Describes lines intersecting each other to form a 90 degree, or right, angle. circle - answer-The set of all points that are equidistant from a point. radius - answer-The distance from the center of a circle or sphere to any point on the outer edge. isosceles trapezoid - answer-Quadrilateral with one pair of parallel opposite sides (the bases) and another pair of equal opposite sides. interior angle - answer-An angle inside a shape between two joined sides. square - answer-A quadrilateral with four equal sides and four 90° angles. regular polygon - answer-A polygon with equal sides and equal angles. central angle - answer-Shape formed when 2 lines or rays meet with vertex meets only the center point of the circle. hypotenuse - answer-The largest side of a right triangle, opposite the right angle. Only right triangles have a hypotenuse. kite - answer-Quadrilateral with two sets of adjacent equal sides and one set of equal opposite angles. reflex angle - answer-Angles greater than 180°. vertical line - answer-A line that runs up and down on the coordinate plane, parallel to the y-axis. It has no run, or change in x-value. parallel - answer-Two lines, line segments, rays, or planes that are the same distance from one another and never intersect. trapezoid - answer-Quadrilateral with one pair of parallel opposite sides. bisect - answer-To divide into two equal parts. isosceles triangle - answer-A triangle with two equal sides and two equal corresponding angles. angle - answer-The amount of rotation (often measured in degrees) needed to make one line segment, ray, or line identical with another line segment, ray, or line. inscribed angles - answer-Shape formed when 2 lines or rays meet with a vertex that meets the circumference of a circle. vertex - answer-A point where two line segments meet to form an angle. irregular polygon - answer-A polygon whose sides are not all equal and whose angles have different measures. straight angle - answer-An angle that measures 180 degrees. line segment - answer-Shortest distance between two points; completely straight with two endpoints. rectangle - answer-Quadrilateral with four right angles, equal opposite sides, and two sets of parallel opposite sides. sector - answer-A portion of a circle defined by two radii and an intercepted arc. triangle inequality theorem - answer-For every triangle, the sum of any two sides is always greater than the third side. parallelogram - answer-Quadrilateral with opposite, parallel, equal sides and equal opposite angles. ray - answer-A line with a single endpoint (or point of origin) that extends infinitely in the other direction. acute angle - answer-Angles less than 90°. equilateral triangle - answer-A triangle with three equal sides and three angles of 60 degrees each. x-axis - answer-The horizontal line that passes through the origin on a coordinate plane. origin - answer-The point on a coordinate plane where the x-axis and y-axis intersect. Typically, the point represents 0 on both axes. center - answer-The point from which all the points on a circle are equidistant. right angle - answer-An angle of 90° diameter - answer-The distance from one side of a circle to the other side that passes through the center point. pi - answer-An irrational number that is approximately equal to 3.14. It is often used in geometry in the context of circles. This constant is the value of the circumference of a circle with a diameter of 1. It is also the value of the area of a circle that has a radius of 1. area - answer-The amount of space inside a two-dimensional figure. complementary angles - answer-Two angles whose sum is equal to 90°. supplementary angles - answer-Two angles whose sum is equal to 180°. obtuse angle - answer-Angles greater than 90°, but less than 180°. coordinates - answer-Identify the location of the point in relation to the axes, or fixed reference lines of the graph. The x- and y-value of a point. tangent - answer-A straight line that touches a circle at only one point. legs - answer-The sides of a right triangle not opposite the right angle. polygon - answer-Closed figure with at least three straight sides. point - answer-A position in space. arc - answer-Part of the circumference of a circle or other curve. quadrilateral - answer-A flat shape with four straight sides and four angles. scalene triangle - answer-A triangle with sides of three different lengths and angles with three different measures. degrees - answer-The units in which angles are measured, denoted by the symbol °. adjacent - answer-Next to. chord - answer-A line segment that spans a circle. Each end of the line segment is on the edge of the circle.