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5th Grade Geometry
Term | Definition |
---|---|
Intersection | Lines that cross and have one and only one point in common |
Parallel lines | Lines that are always an equal distance apart |
Perpendicular lines | Lines that intersect to form a right angles. |
Quadrilaterals | A polygon with four angles and four sides |
Attribute | A characteristic of a shape |
Classify | To arrange in groups, by some property. |
Properties | Features or characteristics of a figure |
Two dimensional figures | A shape that only has two dimensions of length and width |
Equilateral triangle | A triangle with 3 equal sides and 3 equal angles |
Scalene triangle | A triangle in which all three sides are a different length |
Isosceles triangle | A triangle with two equal sides and equal angles |
Acute triangle | A triangle with 3 acute angles |
Obtuse triangle | A triangle with one obtuse angle. |
Right triangle | A triangle with one right angle. |
Perimeter | The distance around a figure. |
Area | The size a surface takes up. • area is measured in square units. |
Volume | The amount of space occupied by an object. |
Cube | A three-dimensional solid that has six congruent square faces. |
Composite shape | A figure made up to two or more shapes. |
Rectangular prism | A solid three-dimensional shape with two identical, rectangular bases |
Prism | A solid three-dimensional shape with two identical, parallel polygon bases |
Three dimensional figure | An figure that has length, width, and height |
Base | The bottom line of a plane shape or the bottom face of a solid |
Width | The distance across from side to side |
Height | The measurement from top to bottom. |
Dimensions | The measurable size of something. • often refers to length, width and height |
Edge | The side of a polygon or a line segment where two faces of a solid figure meet. |
Hexagon | A polygon with 6 sides. |
Pentagon | A polygon with 5 sides. |
Triangle | A polygon with three angles and three sides |
Rectangle | A quadrilateral with pairs of opposite equal parallel sides, four right angles |
Square | A quadrilateral with four equal sides and four right angles; opposite sides that are parallel |
Rhombus | A quadrilateral with four equal sides, opposite sides are parallel, equal opposite angles |
Trapezoid | A quadrilateral with at least one pair of parallel sides. |
Polygon | A closed plane shape having three or more straight sides. |
Parallelogram | A quadrilateral with opposite sides that are parallel and opposite angles are equal. |
Pentagon | A polygon with 5 sides. |
Right Angle | An angle measuring 90º |
Acute Angle | An angle measuring less than 90 degrees |
Obtuse Angle | An angle that measures between 90º and 180º |