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Definitions and explanations of various geometry terms related to angles, triangles, and shapes for Grade 4 students. Topics include acute angles, acute triangles, adjacent angles, complementary angles, degrees, equilateral triangle, figure, interior of an angle, intersecting lines, isosceles triangle, line, line segment, obtuse angle, obtuse triangle, parallel, perpendicular, point, protractor, ray, right angle, right triangle, scalene triangle, straight angle, supplementary angles, triangle, vertex, and vertical angles.
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An angle with a measure of less than 90 degrees.
A triangle with all interior angles measuring less than 90 degrees.
Two angles <AOC and <COB, with a common side OC, are adjacent angles.
Union of two different rays sharing a common vertex, ex <AOB
Connected portion of a circle.
Three or more points are collinear if there is a line containing all of the points; otherwise, the points are non-collinear.
arc
Triangle with three equal sides.
Set of points in the plane.
The convex region defined by the angle.
Lines that contain at least one point in common.
Triangle with at least two equal sides.
Circular distance around the arc.
Angle with a measure greater than 90 degrees, but less than 180 degrees.
Triangle with an interior obtuse angle.
Two lines in a plane that do not intersect, ex. AB CD
d
Two lines are perpendicular if they intersect, and any of the angles formed between the lines is a 90 degree angle, ex. EF GH
Precise location in the plane.
Instrument used in measuring or sketching angles.
Triangle with no sides or angles equal.
Angle that measures 180 degrees.
Two angles with a sum of 180 degrees.
A triangle consists of three non-collinear points and the three line segments between them. The three segments are called the sides of the triangle, and the three points are called the vertices.
A point, often used to refer to the point where two lines meet, such as in an angle or the corner of a triangle.
When two lines intersect, any two non-adjacent angles formed by those lines are called vertical angles or vertically opposite angles.
Polygon with four sides.
Quadrilateral with four right angles.
Quadrilateral with four sides of equal length.
Rectangle with all sides of equal length.
Result of adding two or more numbers.
Example: 30˚+ 45˚ = 75˚
Quadrilateral with at least one pair of parallel sides.
