Question | Answer |
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%) |