**TI83F* AppVariable file 04/07/08, 13:49A AMC109AAnav BB89E8C391A14EE0A1ECD560CF6CB76EMC109.MC1091   acute angle !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. complementary anglesS!complementary angles:Two angles are complementary if the sum of their measures is 90. In the figure,1 and 2 are complementary angles. congruent angles1congruent angles:Angles with the same measure.  congruent figures=congruent figures:Figures that have the same shape and size. congruent segments>congruent segments:Line segments that have the same length.  corresponding sidesLcorresponding sides:The parts of congruent or similar figures that match.   degreedegree:The most common unit of measure for angles. If a circle were divided into 360 equal-sized parts, each part would have an angle measure of 1 degree, denoted as 1.  equilateral triangle7!aequilateral triangle:A triangle having all three sides congruent and all three angles congruent.  isosceles triangle!Aisosceles triangle:A triangle with at least two congruent sides.   line segmentj!Vline segment:Part of a line containing two endpoints and all the points between them.   obtuse anglek4!Fobtuse angle:An angle that measures more than 90 but less than 180. obtuse triangle1!4obtuse triangle:A triangle having one obtuse angle.  parallelogram9!Xparallelogram:A quadrilateral with both pairs of opposite sides parallel and congruent.  quadrilateral+quadrilateral:A polygon having four sides.  rectangle!2rectangle:A parallelogram with four right angles. rhombus,!3rhombus:A parallelogram with four congruent sides.  right angle`