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Obtuse Angle An angle measure greater than 90 degrees
Right Angle An angle measure equal to 90 degrees
Parallel lines two lines that are always an equal distance apart
Perpendicular lines Two lines that intersect at a 90 degree angle
Congruent Two figures that are the same size and shape. Two lines that are the same size.
Vertex The point where two lines of the figure meet
Category A large group of two-dimensional figures that share at least one attribute
Hierarchy A set of categories and subcategories, based on attributes. For example, in the
category of quadrilaterals, there is the subcategory of rectangles. Within the subcategory of
rectangles, there is the subcategory of squares.
Conversion Changing between units within the same measurement system.
, Customary Measurements Cups, pints, quarts, gallons, inches, feet, yards, miles, ounces,
pounds, tons
Metric Measurements Liters, milliliters, centimeters, meters, kilometers, grams, kilograms
Liquid volume Can be measured in cups, pints, quarts, and gallons or liters and milliliters.
Length Can be measured in inches, feet, yards, and miles, or centimeters, meters, and
kilometers.
Mass Can be measured in ounces, pounds, and tons or grams and kilograms.
Time Measured in seconds, minutes, and hours
Line Plot Used to record measurements for a group of objects. The measurements values
are shown, and a picture or mark is placed above the value for each object being measured.
Solid Figure A 3-D figure, has volume.
Right Rectangular Prism Each face of this 3_D figure is a rectangle.