ph math ch 7 vocabulary words
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| point | tells a location
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| line | series of points that have no end
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| segment | part of a line but it has two endpoints
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| intersecting lines | lines that cross at one point
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| parallel lines | lines that never cross
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| angle | formed by two rays or line segments
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| vertex | point where two line segments or rays meet
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| acute angle | an angle between 0 and 90
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| right angle | an angle that is exactly 90
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| obtuse angle | an angle that is between 90 and 180
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| straight angle | an angle that is exactly 180a line
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| complementary angle | two angle measurements that when added equal 90
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| supplementary angle | two angle measurements that when added equal 180
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| adjacent angles | side by sideshare a vertex and a side
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| vertical angles | angles across from each othershare a vertex but no sidescongruent
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| congruent angles | two angles exactly the same measurement
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| midpoint | point that divides a line segment into two equal parts
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| perpendicular lines | two lines that form right angles
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| arc | part of circle
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| angle bisector | a line that divides an angle into two congruent or equal angles
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| congruent | ~=
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| congruent sides | sides that are the same length
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| triangle | 3 sided closed polygon
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| scalene triangle | a triangle with no congruent sides
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| isosceles triangle | a triangle with at least 2 congruent sides
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| equilateral triangle | a triangle with all sides congruent
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| sum of angles in triangle | 180
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| right triangle | a triangle with one right angle
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| acute triangle | a triangle with 3 acute angles
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| obtuse triangle | a triangle with one obtuse angle and two acute angles
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| polygon | closed plane figure with sides formed by line segments
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| quadrilateral | a polygon with four sides
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| pentagon | a polygon with five sides
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| hexagon | a polygon with six sides
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| heptagon | a polygon with seven sides
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| octagon | a polygon with eight sides
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| nonagon | a polygon with nine sides
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| decagon | a polygon with ten sides
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| regular polygon | a polygon with all sides congruent and all angles congruent
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| irregular polygon | a polygon with no sides or angles congruent
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| trapezoid | a quadrilateral with exactly one pair of parallel sides
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| isosceles trapezoid | a trapezoid with congruent non-parallel sides
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| parallelogram | a quadrilateral with both pairs of opposite sides parallel and congruent
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| rectangle | parallelogram with four right angles
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| square | a parallelogram with four right angles and four congruent sides
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| rhombus | a parallelogram with four congruent sides and no right angles
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| circle | a set of points that are the same distance from the center
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| radius | segment from the center to a point on the circle
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| diameter | segment from one point on circle through the center to another point on the circle
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| chord | segment from one point on circle to another point on circle. Does not go through the circle.
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| central angle | an angle in the circle where the vertex is the center of the circle
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| semi-circle | half of the circumference of a circle
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| circle graph | a graph of data where a circle represents the whole (100%)
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