| A | B |
|---|
| synthetic proof | a method of proof based on a system ofd postulates and theorems in which the properties of figures are studied, but not their actual measurements. |
| inverse | a statement obtained by adding "not" to both the if and then parts of an if-then statement |
| coordinate proof | a method of proof based on a coordinate system in which all points are represented by ordered pairs of numbers |
| inclusive definition | a definition that includes all possibilities |
| inscribed | points intersecting on a circle |
| central angle | an angle with its vertex at the center of a circle |
| major arc | an arc of a circle with a measure greater than 180 and less than 360 |
| indirect proof | a method of proof in which you temporarily assume the opposite of what you want to prove and then show that this leads to an impossible situation or a contradiction of a known fact |
| semiperimeter | half the perimeter |
| regular polyhedron | a space figure whose faces are all regular polygons of one type and which has the same number of faces at each vertex |
| implication | a statement with an if part and then part. the if part is the hypothesis and the then part is the conclusion also called a conditional |
| contrapositive | a statement by interchanging and adding "not" to the if and then parts of an if-then statement |
| isosceles trapezoid | a trapezoid with a line of symmetry that passes through the midpoints of the basses |
| exclusive definiton | a definition that excludes some possibilities |
| circumscribed | about a ploygon when each vertex of the ploygon lies on the circle |
| minor arc | an arc of a circle with a mesure less than 180 |
| inscribed angle | an angle formed by two chords intersecting at a point on a circle |
| tangent | a line in the plane of the circle that intersects the circle in exactly one point |
| polyhendrom | a space figure whose faces are polygons |
| net | a set of polygons that can be used to make a polyhedron |
| converse | a statement obtained by interchanging the if and then parts of an if-then statement |
| median of a triangle | a segment joining a vertex of a trinangle to the midpoint of the opposite side |
| trapezoid | a quadrilateral with at least one pair of parallel sides |
| regular ploygon | a polygon with all sides equal in length and all angles equal in measure |
| chord | a segment joining two points on a circle |
| semicircle | an arc of a circle with a measure of 180 |
| intercepted arc | the arc that lies with in an inscribed angle or central angle |
| secant | a line intersecting a circle in two points |
| semiregular polyhedron | a space whose faces are all regular polygons and which has the same number of caces of each type at each vertex |
| defect | the angle measure of the gap in a net for a plyhedron |
