Forty terms, survey-kit plain.
| point | a location with no size |
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| line | a straight path running forever both ways |
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| plane | a flat surface running forever |
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| angle | two rays sharing an endpoint |
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| vertex | the corner where the rays meet |
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| congruent | same size and same shape |
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| similar | same shape, scaled |
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| parallel | lines that never meet |
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| perpendicular | lines meeting at a right angle |
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| transversal | a line crossing two others |
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| polygon | a closed figure of straight sides |
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| quadrilateral | a four-sided polygon |
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| diagonal | a corner-to-corner segment inside a polygon |
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| hypotenuse | the side across from the right angle |
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| altitude | a height drawn at a right angle |
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| bisector | a cutter into two equal parts |
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| circumference | the distance around a circle |
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| radius | center to edge |
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| diameter | edge to edge through the center |
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| chord | a segment with both ends on the circle |
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| tangent | a line touching a circle at exactly one point |
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| inscribed | drawn inside, touching the boundary |
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| volume | the space a solid holds |
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| surface area | the total area of every face |
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