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Geometry definitions
Term | Definition |
---|---|
circle | the set of all points in a plane equal distance from a given point |
secant | a segment that intersects a circle in 2 points with a point as an endpoint of a segment |
central angle | an angle whose vertex is the center of the polygon and whose side contains 2 consecutive verticies |
Tangent | line that intersects a circle in exactly 1 point |
point of tangency | a point where the line touches the circle |
radius | distance from the center to a point on the circle |
congruent circles | 2 circles that have same radius |
Major arc | > 180 |
Minor arc | < 180 |
sector | a region bounded by 2 radius of a circle and intercepted arc |
semicircle | 180 |
arc length | circumferance of a circle |
apothom | distance from center of polygon to any side |
diameter | a chord that goes through the center of a circle |
chord | segments whose end points ar on the circle |
area of a rectangle | A= LW |
obtuse triangle | all angles > 90 |
acute triangle | all angles < 90 |
median | a segment whose end points are a vertex of a triangle and mid points of opposite side |
scale factor | the ratios of the lengths of 2 corresponding sides of 2 polygons |
midsegment theorem | a segment that connects the mid points of the legs of a trapazoid |
proportion |