• Shuffle
Toggle On
Toggle Off
• Alphabetize
Toggle On
Toggle Off
• Front First
Toggle On
Toggle Off
• Both Sides
Toggle On
Toggle Off
Toggle On
Toggle Off
Front

### How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key

Play button

Play button

Progress

1/33

Click to flip

### 33 Cards in this Set

• Front
• Back
 Parallel Lines Coplanar lines that do not intersect Skew lines Noncoplanar lines that are neither paralled nor intersecting Parallel planes Planes that do not intersect Theorem 3-1 If two parallel planes are cut by a third plan, then the lines of intersection are parallel Postulate 10 If two parallel lines are cut by a transversal, then corresponding angles are congruent. Theorem 3-2 If two parallel lines are cut by a transversal, then alternate interior angles are congruent. Theorem 3-3 If two parallel lines are cut by a transversal, then same-side interior angles are supplementary. Theorem 3-4 If a transversal is perpendicular to one of two parallel lines, then it is perpendicular to the other one also. Postulate 11 If two lines are cut by a transversal and correspond angles are congruent, then the lines are parallel. Theorem 3-5 If two lines are cut by a transversal and alternate interior angles are congruent, then the lines are parallel. Theorem 3-6 If two lines are cut by a transversal and same-side interior angles are supplementary, then the lines are parallel. Theorem 3-7 In a plan two lines perpendicular to the same line are parallel. Theorem 3-8 Through a point outside a line, there is exactly one line parallel to the given line. Theorem 3-9 Through a point outside a line, there is exactly one line perpendicular to the given line. Theorem 3-10 Two lines parallel to a third line are parallel to each other. Scalene triangle None of the sides are congruent Isosceles triangle At least two of the sides are congruent Equilateral triangle All of the sides are congruent Acute triangle A triangle with three acute angles Obtuse triangle A triangle with one obtuse angle Right triangle A triangle with one right angle Equiangular triangle A triangle whose angles are all congruent Theorem 3-11 The sum of the measures of the angles of a triangle is 180 Corollary 1 If two angles of one trianble are congruent to two angles of another triangle, then the third angles are congruent. Corollary 2 Each angles of an equiangular triangle has measure 60. Corollary 3 In a triangle, there can be at most one right angle or obtuse angle. Corollary 4 The acute angles of a right triangle are complementary. Theorem 3-12 The measure of an exterior angle of a triangle equals the sum of the measures of the two remote interior angles. Polygon 1. Each segment intersects exactly 2 other segments, one at each endpoint 2. No 2 segments within a common endpoint are collinear Convex polygon Polygon in which no line containing a side of the polygon contains a point in the interior of the polygon Theorem 3-13 The sum of the measures of the angles of a convex polygon with n sides is (n-2)180 Theorem 3-14 The sum of the measures of the exterior angles of any convex polygon, one angle at each vertex, is 360 Regular polygon Polygon that is both equiangular and equilateral