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Geometry Study Guide for High School Equivalency Test Preparation for any High School Equivalency (HSE) Test is best achieved when broken into sizeable sections for review. Within the math portion of the tests alone students are responsible for a number of different concepts. Geometry is among the mathematics material that students should be familiar with. Differing from basic operations, geometry is understood through the use and application of key terms. Fundamental terms include:

• Acute Angle – An angle measuring greater than 0 degrees but less than 90 degrees
• Central Angle – An angle with its vertex at the center of a circle
• Chord – The line segment between two points on a curve
• Concurrent – When 3 or more lines meet in a single point
• Congruent – When all current lengths are the same; When corresponding angles measure the same
• Diameter – A straight line passing through the center of a circle
• Equilateral Triangle – A triangle with all sides and angles equal
• Intersecting Lines – Line segments that cross each other
• Line – A straight one dimensional figure extending indefinitely in both directions; A continuous extent of length
• Line Segment – One part of a line
• Obtuse Angle – An angle measuring greater than 90 degrees but less than 180 degrees
• Parallel Lines – Line segments that do not intersect
• Parallelogram – A quadrilateral with both opposite sides parallel to each other
• Perpendicular Lines – Two line segments crossing to form 90 degree angles
• Point – A position in space
• Quadrilateral – A four sided figure
• Radius – A straight line extending from the center of the circle to its circumference
• Ray – The point of a straight line that starts at a point on the line and extends in one direction
• Rhombus – An equilateral parallelogram with four equal sides and oblique (acute and obtuse) angles
• Right Angle – An angle measuring 90 degrees
• Right Triangle – A triangle with one angle measuring 90 degrees
• Scalene Triangle – A triangle with three unequal sides and angles
• Trapezoid – A quadrilateral plane figure with two parallel sides and two non-parallel sides
• Vertex – The intersecting point of sides of two plane figures

Knowledge of key terms and their definitions is necessary for success on the Geometry portion of HSE tests. In addition to knowing the terms, students should be able to identify them in illustrations and diagrams. The knowledge of fundamental terms is also required when students come across the terms as they are used in word problems. Studying the terms and their relationship to one another will strengthen the understanding of each concept.