| A | B |
|---|
| volume | a measure of the amount of space inside a three-dimensional figure; measured in cubic units |
| angle | a figure made of 2 rays extending from the same point |
| vertex | the point where 2 rays come together to form an angle |
| right angle | looks like a square corner; measures 90 degrees |
| line | a set of points continuing in opposite directions |
| segment | a set of points forming the shortest path between two points |
| ray | a set of points continuing in one direction only |
| diameter | a segment that crosses a circle through its center from one side to another |
| radius | a segment from the center of a circle to any point on the curve of the circle; equals half the diameter of the circle |
| solids | three-dimensional figures |
| rectangular solid | each face is a rectangle; the corners are all rectangles; ex. cardboard box |
| cube | a special type of rectangular solid; each side has the same measurement; ex. block |
| cylinder | solid; top and bottom are circles; ex. tin can |
| sphere | a solid the shape of a ball |
| perimeter | the measurement of the distance around a flat figure |
| circumference | the distance around a circle |
| area | the measurement of the amount of surface within the perimeter of a flat figure; measured in square units |
| parallel lines | lines that run in the same direction and do not cross each other |
| vertical lines | lines that run straight up and down |
| horizontal lines | lines that run straight across |
| geometry | the study of lines, angles, flat figures, and three-dimensional shapes |
| perpendicular lines | lines that cross or meet to form right angles |
| plane figure | a figure that is completely flat such as a rectangle, square, or triangle |
| rectangle | a 4-sided figure with 4 right angles; opposite sides are parallel and equal |
| square | a 4-sided figure with 4 right angles and 4 equal sides; opposite sides are parallel |
| triangle | a three-sided figure |
| circle | a flat figure made up of a curve; every point of the curve is the same distance from the center |
