Lines, rays and line segments
Four small drawings, each with two lettered points. A line has an arrow at both ends, a ray has a dot at one end and an arrow at the other, and a line segment has a dot at both ends. The student picks the figure that is a line, a ray or a line segment, picks the one with a given name such as ray CD, or says how many endpoints a figure has: 0, 1 or 2.
The traps are in the names and the dots. A ray is named from its endpoint first, so ray CD and ray DC are different pictures, and both are on the page when one of them is asked for. The lettered points are dots too, but only a dot at an end is an endpoint, so a student who counts dots says 2 every time. The working looks at the two ends of each figure in turn.
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What changes each time
- Which figure is a line, a ray or a line segment; which one is ray CD; or how many endpoints
- Four drawings at any angle in steps of 5 degrees, no two within 15 degrees of each other
- Points lettered from 23 capital letters, leaving out I, O and Q
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