Across
- 5. area- The area required to cover a three dimensional shape
- 7. The measure of the amount of surface enclosed by the boundary of a figure. To find the area A of a figure, you can count how many square unit squares it takes to cover the figure. You can find the area of a rectangle by multiplying the length by width. This is a shortcut method for finding the number of unit squares it takes to cover the rectangle. If a figure has curved or irregular sides, you can estimate the area. Cover the surface with a grid and count whole grid squares and parts of grid squares. When you find the area of a shape, write the units, such as square centimeters, to indicate the unit square that was used to find the area.
- 8. The measure of the distance around a two dimensional figure. Perimeter is a measure of length. To find the perimeter P of a figure, you count the number of unit lengths it takes to surround a figure. When you find the perimeter of a shape, write the units to indicate that the unit was used to find the perimeter. The perimeter of a square below is 12 units, because 12 units of length surrounds the figure. The perimeter of the rectangle is 18 units. Notice that the rectangle has a greater perimeter, but a lesser area, than the square.
- 10. A line segment formed where two faces of a three dimensional shape meet.
- 12. A shape formed by three or more line segments, called sides. Each segment meets exactly two other segments, but only at their endpoints.
- 14. polygon- ‘A polygon that has all all of its sides equal and all of its angles equal.
- 15. A flat two dimensional surface of a three dimensional shape.
Down
- 1. triangle- A triangle with no sides equal.
- 2. A corner of a polygon
- 3. A two dimensional pattern that can be folded into a three dimensional figure
- 4. triangle- A triangle with two sides the same length.
- 6. lines- Lines that meet at right angles. The length and width of a rectangle are perpendicular to each other and the base and height are perpendicular to each other. In diagrams, perpendicular lines are often indicated by drawing a small square where the lines meet.
- 9. angle- An angle that measures 90 degrees. A rectangle has four right angles.
- 11. The amount of space occupied by the capacity of a three dimensional shape. The volume is a number of unit cubes that will fit into a three dimensional shape.
- 12. A three dimensional shape with one polygonal base and lateral faces that are all triangles that meet at a vertex opposite the base.
- 13. A three dimensional shape with a top and bottom (base) that are congruent polygons and lateral faces that are parallelograms