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30 Cards in this Set

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9-1
Two parallel lines lie in exactly one plane
9-2
In a plane if two lines are perpendicular to the same line, then they are parallel
9-3
Let L be a line and let P be a point not on L. Then there is at least one line through P, parallel to L
9-4
If two lines are cut by a transversal, and one pair of alternate interior angles are congruent, then the other pair of alternate interior angles are also congruent
9-5
Given two lines cut by a transversal. If a pair of alternate interior angles are congruent, then the lines are parallel
9-6
Given two lines cut by a transversal. If a pair of corresponding angles are congruent, then a pair of alternate interior angles are congruent
9-7
Given two lines cut by a transversal. If a pair of corresponding angles are congruent, then the lines are parallel
9-8
Given two lines cut by a transversal. If a pair of interior angles on the same side of the transversal are supplementary, the lines are parallel
9-9
If two parallel lines are cut by a transversal, each pair of corresponding angles are congruent
9-10
In a plane, if a line intersects one of two parallel lines in only one point, then it intersects the other
9-11
In a plane, if two lines are each parallel to a third line, then they are parallel to each other
9-12
In a plane, if a line is perpendicular to one of two parallel lines it is perpendicular to the other
9-13
For every triangle, the sum of the measures of the angles is 180
9-14
Each diagonal separates a parallelogram into two congruent triangles
9-15
In a parallelogram, any two opposite sides are congruent
9-16
In a parallelogram, any two opposite angles are congruent
9-17
In a parallelogram, any two consecutive angles are supplementary
9-18
The diagonals of a parallelogram bisect each other
9-19
Given a quadrilateral in which both pairs of oposite sides are congruent. Then the quadrilateral is a parallelogram
9-20
If two sides of a quadrilateral are parallel and congruent, then the quadrilateral is a parallelogram
9-21
If the diagonals of a quadrilateral bisect each other, then the quadrilateral is a parallelogram
9-22
The segment between the mid-points of two sides of a triangle is parallel to the third side and half as long
9-23
If a parallelogram has one right angle, then it has four right angles, and the parallelogram is a rectangle
9-24
In a rhombus, the diagonals are perpendicular to one another
9-25
If the diagonals of a quadrilateral bisect each other and are perpendicular, then the quadrilateral is a rhombus
9-26
The median to the hypotenuse of a right triangle is half as long as the hypotenuse
9-27
30-60-90 Triangle Theorem
If an acute angle of a right triangle has measure 30, then the opposite side is half as long as the hypotenuse
9-28
If one leg of a right triangle is half as long as the hypotenuse, then the opposite angle has measure 30
9-29
If three parallel lines intercept congruent segments on one transversal T, then they intercept congruent segments on every transversal T' which is parallel to T
9-30
If three parallel lines intercept congruent segments on one transversal, then they intercept congruent segments on any other transversal