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Math
Geometry
3rd grade Chapter 9 math
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Gravity
Terms in this set (20)
Line
It is straight. It is a set of points that extend forever in opposite directions
Line segment
The part of a line between two end points
Ray
The part of a line that starts at an end point. It goes on forever in one direction.
Intersecting lines
Lines that meet at a common point
Parallel lines
Lyons own a flat surface that never intersect
Perpendicular lines
Lines that intersect at square corners ( and make a right angle)
Angles
Are formed by to rays that start out from the same point
Right angle
Forms a square corner
Acute angle
Less than a right angle
Obtuse angle
Greater than a right angle
Polygon
Any closed flat figure with straight sides
Quadrilateral
A polygon with four straight sides
Parallelogram
Quadrilateral that has opposite sides, parallel and equal
Trapezoid
A quadrilateral with only one pair of parallel sides
Right triangle
Has one right angle
Isosceles triangle
Has at least two sides of equal length
Equilateral triangle
All sides are equal
Scalene triangle
No sides are equal length
Congruent figures
Are the same size and the same shape
Similar figures
Are the same shape but may not be the same size
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