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math ch. 7 voc

ph math ch 7 vocabulary words

point tells a location
line series of points that have no end
segment part of a line but it has two endpoints
intersecting lines lines that cross at one point
parallel lines lines that never cross
angle formed by two rays or line segments
vertex point where two line segments or rays meet
acute angle an angle between 0 and 90
right angle an angle that is exactly 90
obtuse angle an angle that is between 90 and 180
straight angle an angle that is exactly 180a line
complementary angle two angle measurements that when added equal 90
supplementary angle two angle measurements that when added equal 180
adjacent angles side by sideshare a vertex and a side
vertical angles angles across from each othershare a vertex but no sidescongruent
congruent angles two angles exactly the same measurement
midpoint point that divides a line segment into two equal parts
perpendicular lines two lines that form right angles
arc part of circle
angle bisector a line that divides an angle into two congruent or equal angles
congruent ~=
congruent sides sides that are the same length
triangle 3 sided closed polygon
scalene triangle a triangle with no congruent sides
isosceles triangle a triangle with at least 2 congruent sides
equilateral triangle a triangle with all sides congruent
sum of angles in triangle 180
right triangle a triangle with one right angle
acute triangle a triangle with 3 acute angles
obtuse triangle a triangle with one obtuse angle and two acute angles
polygon closed plane figure with sides formed by line segments
quadrilateral a polygon with four sides
pentagon a polygon with five sides
hexagon a polygon with six sides
heptagon a polygon with seven sides
octagon a polygon with eight sides
nonagon a polygon with nine sides
decagon a polygon with ten sides
regular polygon a polygon with all sides congruent and all angles congruent
irregular polygon a polygon with no sides or angles congruent
trapezoid a quadrilateral with exactly one pair of parallel sides
isosceles trapezoid a trapezoid with congruent non-parallel sides
parallelogram a quadrilateral with both pairs of opposite sides parallel and congruent
rectangle parallelogram with four right angles
square a parallelogram with four right angles and four congruent sides
rhombus a parallelogram with four congruent sides and no right angles
circle a set of points that are the same distance from the center
radius segment from the center to a point on the circle
diameter segment from one point on circle through the center to another point on the circle
chord segment from one point on circle to another point on circle. Does not go through the circle.
central angle an angle in the circle where the vertex is the center of the circle
semi-circle half of the circumference of a circle
circle graph a graph of data where a circle represents the whole (100%)
Created by: jenwoodlief