PDF Geometry Vocabulary/Definitions (3rd grade) - PC\|MAC
[Pages:4]8. Angle
Geometry Vocabulary/Definitions (3rd grade)
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20. Congruent
24. Area
Two rays with the same end point.
26. Cube
A plane figure with the same size and shape.
29. Cylinder
A solid shape that has: 6 square faces all equal in size, 8 vertices (corners), and 12 equal edges.
The size a surface takes up, measured in square units. 4. Circle
33. Edge
A solid shape with one curved surface and two congruent circular bases.
28. Cone
A polygon made with a continuous line which is always the same distance from the center.
16. Equilateral triangle
Where two surfaces join (intersect).
A solid shape with a circular base and a curved surface that come to a point (vertex).
A triangle that has 3 equal sides.
32. Face
23. Perimeter
17. Isosceles Triangle
The flat surface of a 3D shape. 34. Plane
The distance around the figure.
5. Line
22. Line of Symmetry
A triangle that has 2 equal sides.
36. Plane figure
A straight path that goes without end in two directions.
35. Plane shape
A flat surface. A flat figure that can be closed or not closed.
30. Pyramid
A flat closed shape having only 2 dimensions.
7. Line Segment
The line that divides two matching parts. It can be vertical, horizontal, or diagonal.
13. Parallelogram
Part of a line with two end points.
A quadrilateral (4 sides & 4 angles) where opposites sides are parallel. (ie: Rectangle,
square, rhombus, & diamond are parallograms)
A solid shape with a polygon as a base and triangular faces that come to a point (vertex or
apex)
12. Quadrilateral
9. Right Angle
6. Ray 2. Rectangle
A polygon with 4 sides and 4 angles.
Part of a line that has one end point and goes in one direction without end.
18. Right Triangle
An angle that is 90 degrees (It makes a square in the corner).
25. Rectangular Prism
A Quadrilateral with 4 sides and 4 right angles.
Opposite sides are parallel.
19. Scalene Triangle
A triangle that has one right angle. It can also be an isosceles or scalene triangle.
15. Rhombus
A solid shape that has: 6 faces (4 rectangles & 2 squares), 8 vertices (corners), and 12 equal edges.
10. Side
A triangle that has no equal sides. All 3 sides are different lengths.
a parallelogram with four equal sides and equal opposite angles.
27. Sphere
Line segments of a polygon.
A solid shape that is perfectly round like a ball. No faces, edges, or vertices.
1. Square
31. Volume
21. Symmetry
A quadrilateral with 4 equal sides and 4 right angles.
Opposite sides are parallel.
14. Trapezoid
A plane figure that can be folded along a line so the two parts match.
The amount of space occupied by a 3D object, measured in cubic units.
3. Triangle
A quadrilateral (4 sides & 4 angles) with one pair of parallel sides.
11. Vertex
A polygon with 3 sides and 3 angles.
The point where two sides meet. (Shared end points of the line segments of a polygon.)
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