CENTIMETER A metric unit used to measure length. 1
centimeter
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L INE S EGMENT A part of a line. A line segment has two
endpoints. It starts and stops.
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L INE A straight path that goes on forever in both
directions
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H ORIZONTAL A line that extends from left to right.
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VERTICAL A line that extends up and down.
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P ARALLEL LINES Lines that never intersect or cross.
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P ERPENDICULAR LINES Two lines that cross or meet to form right
angles or square corners.
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PERIMETER The distance around the outside of a figure. To find
perimeter all of the sides in the shape are added together. side +
side + side = perimeter 4 cm 3 cm 4 cm + 4 cm + 3 cm = 11 cm
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QUADRILATERAL A figure with four sides.
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A DJACENT SIDES Two sides that meet at a point. They are next
to each other. They are NOT opposite each other. a b c d Sides a
and d are adjacent to each other. Sides a and c are opposite each
other.
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PARALLELOGRAM A quadrilateral with both pairs of opposite sides
parallel. Only one set of opposite lines are parallel.
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R ECTANGLE A parallelogram that has 4 right angles. Opposite
sides are the same length. 4 cm 2 cm
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SQUARE A special rectangle with four sides of the same length
and four right angles. 3 cm
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RHOMBUS A parallelogram with equal sides. A rhombus does not
have to have right angles but it can. 3 cm 2 cm 4 cm
