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A double number line is very similar to a ratio table in that you use them to solve problems requiring proportions. The ratio table is more flexible in that you do not need to position the numbers in the "correct" position. If you Google using models in realistic mathematics education you will find references to these and ideas how they might be used in the classroom
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How many lines of symmetry does a plolygon have?
It depends on how many sides that it has and whether of not it is regular (all the lines of the polygon are of equal length if it is a regular polygon). For regular polygons, the number of symmetry lines is the number of sides if number of sides is an odd number. Otherwise, the number of symmetry lines is double the number of sides. A square has 4 sides and 8 symmetry lines; a triangle has 3 sides and 3 symmetry lines.
How are perpendicular lines and intersecting line alike?
Perpendicular lines are lines that intersect each other at 90 degrees or at right angles
How are perpendicular lines and intersecting lines alike and how are they different?
Some intersecting lines are perpendicular lines.Take any old pair of intersecting lines. If the angles at the intersectionhappen to be 90 degree angles, then the lines are perpendicular lines.
How are perpendicular lines and intersecting lines alike and different?
they both have lines crossing each other which make angles. perpendicular lines make right angles while intersecting lines make other kinds
Why do number lines have numbers in them?
Because if they did not, then they would not be number lines!
