geometry terms - basic
Terms
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- Measured in cubic units, ______ is the space inside a three dimensional figure.
- Volume
- All three sides of this triangle are of equal lengths.
- Equilateral Triangle
- The ______ of a circle is a straight line segment drawn from the center to one point on the circle.
- Radius
- This quadrillaterial has two pairs of parallel sides.
- Parallelogram
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Some other common polygones and thier number of sides and angles are:
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pentagon - 5
hexagon - 6
heptagon - 7
octagon - 8
nonagon - 9
decagon - 10 - _____ and _________ are not polyhedrons because thier faces are not polygons. But they are three dimensional figures occupying space.
- Cones and Cylinders
- Two angles, equal in measure, that lie on the same side of a transversal line are called _____________ ______.
- Corresponding Angles
- ____________ _____ are lines that meet (intersect) at only one point.
- Intersecting Lines
- A ____ _______ is part of a straight line that starts and stops at specific points.
- Line Segment
- A ____ is an infinite number of points that are aligned with each other.
- Line
- A _____ is an exact location in space.
- Point
- The ______ is the common end point of 2 rays that form an angle.
- Vertex
- An _____ is a figure formed by 2 rays that have a common end point.
- Angle
- An ______ angle measures between 90' and 180'.
- Obtuse
- An _____ angle measures between 0' and 90'.
- Acute
- A __________ is a calibrated tool used to measure the degree of an angle.
- Protractor
- A ________ angle measures exactly 180'.
- Straight
- A _____ angle measures exactly 90'.
- Right
- A ___________ is a straight line that intersects 2 or more straight lines at different angles.
- Transversal
- The angles formed by two intersecting lines are called ________ ______.
- Vertical Angles
- Two lines that intersect to form a right angle are _____________ _____.
- Perpendicular Lines
- A pair of non-adjacent interior angles lying on opposite sides of a transversal are called _________ ________ angles.
- Alternate Interior
- A ___ is part of a line that has one end point, and goes on and on in one direction.
- Ray
- ________ angles are two angles with a common vertex and a common side.
- Adjacent
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_____________ angles are two angles totalling 90'.
They do not need to be adjacent. - Complementary
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_____________ angles are two angles totalling 180'.
They do not need to be adjacent. - Supplementary
- The angles, made by two lines and their transversal, that lie outside the lines 2 lines are ________ angles.
- Exterior
- The angles, made by 2 lines and thier tranversal, that lie inside the two lines are called ________ angles.
- Interior
- A pair of non-adjacent exterior angles, lying on opposite sides of a transversal, are called ________ ________ angles.
- Alternate Exterior
- Two lines that are on the same plane and do not intersect are called ________ _____.
- Parallel Lines
- A _______ is a closed, plane figure with three or more sides. It has the same number of angles as it has sides.
- Polygon
- A ________ is a three sided polygon with angles totalling 180'.
- Triangle
- This triangle has sides of three different lengths.
- Scalene Triangle
- This triangle has two sides of equal lengths.
- Isosceles Triangle
- All the angles in this triangle measure between 0' and 90'.
- Acute Triangle
- One angle in this triangle measures exactly 90'.
- Right Triangle
- One angle in this triangle measures between 90' and 180'.
- Obtuse Triangle
- This closed figure has four sides with four angles totalling 360'.
- Quadrilateral
- This quadrillaterial is a rectangle with all four sides of equal length.
- Square
- This quadrillaterial is a parallelogram with 4 right angles.
- Rectangle
- This quadrillaterial has only one pair of parallel sides.
- Trapezoid
- A ______ is a plane geomtric figure, with all it's points the same distance from a given point called the center.
- Circle
- The ________ of a circle is a straight line segment drawn through it's center, with 2 points of the circle as endpoints.
- Diameter
- The distance around a geometric figure is called the _________.
- Perimeter
- The distance around a circle is called the ____________.
- Cercumference
- Measured in square units, this number indicates the inside size of a plane geometric figure.
- Area
- This geometric figure has multiple faces (sides) shaped like polygons. They are also three dimensional figures that occupy space.
- Polyhedrons
- This polyhedron has bases that are the same size and are also parallel.
- Prisms
- This polyhedron has one base. All the sides are triangular and share the same vertex.
- Pyramids
- _________ _______ are figures that are the same size and shape. The parts of these figures, that are in the same relative position, are call Corresponding parts.
- Congruent Figures