Geometry Flashcards

5493406854	Tangent	intersects a circle in only 1 place.	0
5493406855	Secant	intersects a circle in 2 places.	1
5493406860	Central angle	is equal to its intercepted arc.	2
5493406861	Inscribed angle	is equal to ½ its intercepted arc.	3
5493406872	Adjacent angles	share a common vertex, a common side, but not common interior points.	4
5493406873	Complementary angles	2 angles when added together that equal 90 degrees. They do not have to be adjacent angles.	5
5493406874	Supplementary angles	2 angles when added together that equal 180 degrees.They do not have to be adjacent angles.	6
5493406875	Vertical angles	are congruent	7
5493406876	Alternate interior angles	are congruent.	8
5493406877	Corresponding angles	are congruent.	9
5493406878	Sum of the angles in a triangle	the 3 angles of a triangle add up to 180 degrees.	10
5493406879	Triangles classified by sides	scalene triangles have no equal sides. isosceles triangles have at least 2 equal sides. equilateral triangles have 3 equal sides.	11
5493406880	Triangles classified by angles	acute triangles have 3 acute angles. right triangles have a 90 degree and 2 acute angles. obtuse triangles have an obtuse and 2 acute angles.	12
5493406881	Exterior angle of a triangle	equals the sum of the 2 opposite interior angles.	13
5493406882	Isosceles triangles	sides opposite congruent angles are congruent. angles opposite congruent sides are congruent.	14
5493406883	Triangle inequality theorem	the sum of 2 sides of a triangle must be greater than the 3rd side.	15
5493406885	Median	bisects the opposite side into 2 congruent line segments. median segments are in a ratio of 2 to 1.	16
5493406886	Angle bisector	bisects an angle into 2 congruent angles.	17
5493406887	Altitude	makes a right angle with the opposite side.	18
5493406888	Perpendicular bisector	bisects and makes a right angle with a side of a triangle.	19
5493406889	Similar triangles	angles in similar (∼) triangles are congruent. sides are in proportion.	20
5493406890	Proving triangles similar	need only 2 angles to be congruent to prove 2 triangles similar.	21
5493406891	Proving triangles congruent	can not be angle angle side (A.S.S.) or side side angle(S.S.A.).	22
5493406892	C.P.C.T.C.	corresponding parts of congruent triangles are congruent.	23
5493406893	Pythagorean theorem	a squared plus b squared equals c squared. the hypotenuse is always c.	24
5493406920	Perimeter	distance around the outside of a polygon.	25
5493406934	Transformations	Dilations are a capital D. Reflections are a lower case r. Rotations are a capital R. Translations are a capital T.	26
5493406935	Dilation	Multiply both coordinates by the scale factor.	27
5493406936	Reflection over the x axis	change the sign of the y coordinate.	28
5493406937	Reflection over the y axis	change the sign of the x coordinate.	29
5493406938	Reflection over the line y=x	switch the x and y coordinates.	30
5493406939	Rotation of 90 degrees	graph the coordinate. rotate the graph 90 degrees counter clockwise and read the new point.	31
5493406940	Rotation of 180 degrees	graph the coordinate. rotate the graph 180 degrees counter clockwise and read the point.	32
5493406941	Rotation of 270 degrees	graph the coordinate. rotate the graph 270 degrees counter clockwise and read the point.	33
5493406942	Translation	add the 2 integers to the orginal coordinate. add the first integer to the x coordinate and the second integer to the y coordinate.	34
5493406952	Plane	has no thickness and extends forever in all directions.	35
5493406953	Line	has no thickness, but it extends forever in both directions.	36
5493406955	Collinear points	are points that lie on the same line	37
5493406956	Coplanar points	are points that lie on the same plane	38
5493406957	Parallel lines	are lines on the same plane that never touch.	39