49 terms

point

exact location (looks like a dot)

line

straight path that goes on forever in both directions

line segment

part of a line that has a beginning and an end

ray

line with a beginning but no end

plane

flat surface that goes on forever in all directions

angle

2 rays that meet together at a common point

vertex

point where the 2 rays meet at

acute angle

an angle that is less than 90 degrees

obtuse angle

an angle that measures more than 90 degrees

right angle

an angle that measures exactly 90 degrees

straight angle

an angle that is exactly 180 degrees

complementary angles

angles who add up to 90 degrees

supplementary angles

angles who add up to 180 degrees

congruent

same shape, size

parallel lines

lines that are the same width apart, they don't get closer nor do they get farther apart

perpendicular lines

lines that intersect and make a 90 degree angle

skew lines

lines in different planes, they don't intersect and aren't parallel

interior angles

angles inside parallel lines-cut by a transversal

exterior angles

angles outside parallel lines-cut by a transversal

alternate interior angles

criss cross angles on the inside of parallel lines cut by a transversal

alternate exterior angles

criss cross angles on the outside of parallel lines cut by a transversal

corresponding angles

angles in the same locations on different lines

vertical angles

criss cross angles on the same line

transversal

line that intersects 2 or more parallel lines

polygon

simple closed figures with at least 3 sides

regular polygon

polygon with equal sided and equal length

triangle

3 sided polygon with 3 angles

quadrilateral

4 sided polygon with 4 angles

pentagon

5 sided polygon with 5 angles

hexagon

6 sided polygon with 6 angles

heptagon

7 sided polygon with 7 angles

octagon

8 sided polygon with 8 angles

nonagon

9 sided polygon with 9 angles

decagon

10 sided polygon with 10 angles

acute triangle

has three acute angles

right triangle

triangle that has a right angle

obtuse triangle

has an obtuse angle

equilateral triangle

triabgle that has three sides that are congruent

isosceles triangle

triangle that has 2 congruent sides

scalene triangle

triangle that has no congruent angles

quadrilateral

a polygon with 4 sides (simple closed figure with 4 sided and angles

parallelogram

is a quadrilateral with 2 pairs of parallel sides ( its sided are both parallel and congruent)

rectangle

a parallelogram that has 4 right angles ( a quadrilateral with 4 right angles)

rhombus

a parallelogram with 4 congruent sides (a quadrilateral with 4 congruent sides

square

parallelogram with 4 right angles and 4 congruent sides (a quadrilareral with 4 right angles adn 4 congruent sides; a rectangle with 4 congruent sides)

trapezoid

a quadrilareral with exactly one pair of parallel sides

concave polygon

polygon that has at least 1 concave angle (caves in)

convex polygon

polygon that has all convex angles (pushes out)

kite

polygon or a quadrilateral