Unit # 1 Vocabulary Review

Unit # 1 Vocabulary Review

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coordinate plane

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- a plane (2 dimensional)- formed by intersection - of horizonal line ( x axis)- of vertical line (y axis)

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ordered pair- numbers that identify- a point on- a coordinate plane

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Why does this represent a plane?

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plane• flat surface• extends infinitely in all

directions• has two dimensions

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A? B? C?

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measure of angle

What unit is used to measure an angle?

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Degrees

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Why type of angle? A? B? C? D? E? F?

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Right Angle

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acute angle• an angle• whose measure • is less than 90 degrees

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obtuse angle• an angle • whose measure is • greater than 90 degrees but• less than 180 degrees

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Obtuse angle

Why are these obtuse angles?

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What type of angle?

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What type of angles?

complementary angles

complementary angles• two angles• whose measures • add to 90 degrees

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supplementary angles?vertical angles? congruent angles?

supplementary angles

• two angles• whose measures• have a sum of 180 degrees

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Why are figure 1 and figure 2 both examples of supplementary angles?

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vertical angles

• a pair of• opposite congruent angles• formed by intersecting lines

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congruent angles

• angles • that have the same measure

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What concept do these figures represent?

line of symmetry

the imaginary “mirror” in line symmetry

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transformation - transform

• a change • in the size or• position of a figure

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transformations (transform)

translations (translate)rotations (rotate)

reflections (reflect)

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reflection

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translation

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rotation

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translation

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reflection

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translation

Translation – translate

• a transformation• movement (slide)• of a figure • along a straight line

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Translation• movement • of a figure• along a straight line

rotation - rotate

• a transformation• in which a figure• is turned around a point

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reflection

• a transformation• of a figure• that flips the figure across a line

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