## Math Terms- Geometry- Angles and Lines

##### Created by:

ElmoAW  on October 14, 2010

##### Description:

geometry ms. malone. 1st semester- 1st nine weeks also incorperated with shapes is animals, made by cassie and alyssa)

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# Math Terms- Geometry- Angles and Lines

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#### Definitions

triangle three sides
pentagon 5 sides
hexagon 6 sides
heptagon 7 sides
octagon 8 sides
nonagon 9 sides
decagon 10 sides
undecagon 11 sides
dodecagon 12 sides
concave caved in
convex not caved in
perimeter you add up the lengths of the sides
parallel lines two lines in the same plane that do not intersect
perpendicular lines two lines on different planes which intersect to form right angles
skew lines two lines on different planes which are not parallel but will not intersect
parallel planes planes which do not intersect
perpendicular planes planes which intersect at right angles
transversal a line which crosses any other lines
interior angles angles inbetween the two main lines
exterior angles angles outside the two main lines
alternate interior angles interior angles which are on opposite sides of the transversal. The pair must have one angle from each family. (congruent)
alternate exterior angles exterior angles which are on opposite sides of the transversal. The pair must have one angle from each family. (congruent)
corresponding angles angles which occupy the same position. The pair must have one angle from each family. (congruent)
consecutive interior angles interior angles which are on the same side of the transversal. The pair must have one angle from each family. (supplementary)
obtuse angle an angle which measures more than 90 degrees but less then 180 degrees.
complementary angles two angles whose sum together is 90 degrees
adjacent angles two angles that share a common side between them.
right angle an angle whose measure is exactly 90 degrees.
midpoint the middle point of a line segment which divides it into two equal parts.
angle bisector a ray which divides an angle into two equal angles.
supplementary angles two angles whose sum together is 180 degrees.
linear pair a pair of adjacent angles whose sum is 180. (supplementary)
straight angle an angle whose sum is exactly 180 degrees.
vertical angles opposite angles formed by intersecting lines (congruent)
acute an angle which is greater then 0 degrees but less then 90 degrees.

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