**TI83F* AppVariable file 03/22/07, 09:52* *GLPA09**nav AEC13267AEFC43F88E67E1C0E88B5B83GLPA09.GLPA091   acute angleO!Gacute angle:An angle with a measure greater than 0 and less than 90. acute triangle"!Facute triangle:A triangle in which each angle measures less than 90. angle!angle:A figure formed by two rays with a common endpoint. In the figure, RST is formed by rays SR and ST with the common endpoint (or vertex) S.  congruent#congruent:Having the same measure. conversefconverse:The statement formed by exchanging the hypothesis and conclusion of a conditional statement. Distance FormulaDistance Formula:The distance between two points, with coordinates (x1, y1) and (x2, y2), is given by d = ((x2 - x1)^2 + (y2 - y1)^2). equilateral triangle !aequilateral triangle:A triangle having all three sides congruent and all three angles congruent.  hypotenuse!Bhypotenuse:The side opposite the right angle in a right triangle.  indirect measurementJindirect measurement:A technique using proportions to find a measurement.  irrational numbersoirrational numbers:Numbers that cannot be expressed as fractions, terminating decimals, or repeating decimals.  isosceles triangle (!Aisosceles triangle:A triangle with at least two congruent sides.  legs!>legs:The sides of a right triangle that form the right angle.   line segment8!Vline segment:Part of a line containing two endpoints and all the points between them.  obtuse angle~!Fobtuse angle:An angle that measures more than 90 but less than 180. obtuse triangle !4obtuse triangle:A triangle having one obtuse angle. Pythagorean TheoremPythagorean Theorem:If a and b are the measures of the legs of a right triangle and c is the measure of the hypotenuse, thenc^2 = a^2 + b^2.  radical sign4radical sign:The symbol , used to indicate a root.  real numbersJreal numbers:The set of rational numbers and irrational numbers together.  right angle! !0right angle:An angle that measures exactly 90. right triangle!2right triangle:A triangle having one right angle. scalene triangleg%!5scalene triangle:A triangle with no congruent sides. similar figuresTsimilar figures:Figures that have the same shape but not necessarily the same size.  square rootsquare root:One of the two equal factors of a number. If a^2 = b, then a is the square root of b.Example: 12 is a square root of 144 since12^2 = 144. straight angle,straight angle:An angle that measures 180. triangle'triangle:A polygon having three sides. vertex of an angle!Fvertex of an angle:The common endpoint of the rays forming the angle.8`d`  8@@ 0 0` @@` 0 0`  @@`9`  ' @P@ P H@ @@  @!_ @ 8`  @@ @@ @ @@8`@@ @"@E5d edT STTQc3S#@@BLB@@ @     @L@8`@ b@ @ 4 `< "e` S` R@d8D4@ 0Ā#0 0  0" e 0S <4 8`8$8$8 < ?  8<8`@@  @P3VIP VJeJ` 5JEI@3520dBLB@@ @     @L@8`p0P@ @@ @@ @@?8`@``@8`@`@ @  @@@@ @ @ @@@@ @  @ @8`@`@ @   @@@ @ @  @@@ @ @ @8`AD `J 1 SL ! UHiS& a `"% &1$P@0pBL@4@a !`   "10%  *)G@** 0 Q@00d