Download A flat surface that has no thickness and extends

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Lines
Plane – A flat surface that has no thickness and extends forever. Point – an exact location Line – a straight path that has no thickness and extends forever in opposite directions Ray – Part of a line that has one endpoint and extends forever in one direction. Line Segment – Part of a line that has two endpoints. Congruent – figures that have the same shape or size. (Same length for line segments). Perpendicular lines – Two lines that make a 90 angle when they intersect. Parallel Lines – Lines that never intersect. 2
ANGLES
Right Angle – an angle that measures exactly 90o. Acute Angle – An angle that measures greater than 0 o but less than 90 degrees. Obtuse Angle – An angle that measures greater than 90 o but less than 180 o. Straight Angle – Angle that measures exactly 1800. Complementary angles – The sum of two angles equals 900. Supplementary Angles – The sum of two angles equals 1800. Adjacent angles – have a common vertex and a common side. Vertical angles – opposite angles formed by two intersecting lines. Transversal – a line that intersects two or more lines. Properties of Transversals to Parallel Lines 1. Corresponding angles are congruent Polygons
Polygon – a closed plane figure formed by three or more line segments. Regular Polygon – a polygon in which all sides and all angles are congruent. Triangle – 3 sides, 3 angles Quadrilateral – 4 sides, 4 angles Pentagon – 5 sides, 5 angles Hexagon – 6 sides, 6 angles Heptagon – 7 sides, 7 angles Octagon – 8 sides, 8 angles Nonagon – 9 sides, 9 angles Decagon – 10 sides, 10 angles 1
Triangles
Scalene triangle – no congruent sides. Isosceles triangle – at least two congruent sides. Equilateral triangle – all sides are congruent. Acute triangle – all angles are acute Obtuse triangle – has exactly one obtuse angle Right Triangles
Right Triangle – has exactly one right angle. Legs – two sides the form the right angle in a right triangle Hypotenuse – The side opposite the right angle in a right triangle. It is also the longest side. The Pythagorean Theorem – A special relationship between the sides of a right triangle. Areas of Polygons
Area of a Triangle -­‐ Area of a Rectangle -­‐ Area of a Parallelogram -­‐ Area of a Trapezoid -­‐ 2
Quadrilaterals
Parallelogram – Opposite sides and opposite angles are congruent. Rectangle – Parallelogram with four right angles Rhombus – Parallelogram with four congruent sides. Square – Parallelogram with four congruent sides and angles. Trapezoid – A quadrilateral where exactly one pair of opposite sides are parallel. Polygon Measurements
The sum of the measures of a triangle is 180. The sum of the measures of a quadrilateral is 360. Perimeter the distance around a geometric figure. To find the perimeter, add the lengths of it’s sides. Perimeter of a rectangle: Circles
Circle – all points in a plane that are the same distance from a given point, called the center of a circle. Diameter – Line segment that passes through the center of a circle and whose endpoints lie on the circle. Radius – Line segment whose endpoints are the center of a circle and any point on the circle. Chord – Line segment whose endpoints are any two points on a circle. Arc – Part of a circle named by it’s endpoints. Central Angle – An angle formed by two radii (radius). Sector – part of the circle enclosed by the two radii and an arc connecting them. Circumference of a circle. Area of a Circle: There are 3600 degrees in a circle.