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Learn about the coordinate plane, angle measurement, and angle types such as right, acute, and obtuse angles. Explore complementary and supplementary angles, vertical angles, and congruent angles in geometry.
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a plane (2 dimensional) • formed by intersection • of horizonal line ( x axis) • of vertical line (y axis)
ordered pair - numbers that identify - a point on - a coordinate plane
plane • flat surface • extends infinitely in all directions • has two dimensions
measure of angle What unit is used to measure an angle?
acute angle • an angle • whose measure • is less than 90 degrees
obtuse angle • an angle • whose measure is • greater than 90 degrees but • less than 180 degrees
Why are these obtuse angles? Obtuse angle
complementary angles complementary angles two angles whose measures add to 90 degrees
supplementary angles? vertical angles? congruent angles?
supplementary angles two angles whose measures have a sum of 180 degrees
Why are figure 1 and figure 2 both examples of supplementary angles?
vertical angles a pair of opposite congruent angles formed by intersecting lines
congruent angles angles that have the same measure
line of symmetry the imaginary “mirror” in line symmetry
transformation - transform a change in the size or position of a figure
transformations (transform) translations (translate) rotations (rotate) reflections (reflect)