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# Geometry

### Guide for First Test

TermDefinition
Ratio A ratio is the comparison of 2 numbers or quantities
Compression Ratio Volume of cylinder with piston at the bottom of its stroke to vol. when the piston is at the top of the stroke.
Aspect Ratio Ratio of the length (or span) of an airfoil to its width (or chord)
Glide Ratio Ratio of forward distance traveled to vertical distance descended
Air/Fuel Ratio Ratio of weight of air to weight of fuel in the mixture being fed to the engine
Gear/Speed Ratio It is the ratio of the angular velocity of the input gear to the angular velocity of the output gear.
Proportions Statement of equality between 2 or more ratios
Percentage Parts out of one hundred, represented by %
Algebra Branch of mathematics that uses letters or symbols to represent variables in formulas and equations
PEMDAS Please Excuse My Dear Aunty Sally
BODMAS Brackets, Operations, Division, Multiplication, Addition, and Subtraction
Geometry Branch of mathematics that deals with shapes, sizes, relative position of figures, and the properties of space.
Acute Angle Angle less than 90
Right Angle 90 degree angle
Obtuse Angle Greater than 90 degrees
Straight Angle line or 180 degree angle
Reflex Angle Angle that surrounds any angle
Vertical Angles
Linear Pair
Complementary Angles When the sum of 2 angles = 90°, they are called complementary angles
Supplementary Angles When the sum of 2 angles = 180°, they are called supplementary angles
Units for Angles Degrees, radians
Area Measurement of the amount of surface of an object
Sector The plane figure enclosed by two radii of a circle and the arc between them.
Polygon A polygon is an enclosed shape made up of straight lines.
Regular Polygon A regular polygon has all its sides and angles equal.
Apothem The line joining the center of a regular polygon to the mid point of any of its sides
Volume The amount of space contained within a solid
Cube Cube is a special type of rectangular solid
Cylinder Solid having the shape of a can, or length of a pipe, or a barrel
Piston Displacement Total volume (in cubic inches, cubic centimeters, or liters) swept by all of the pistons of a reciprocating engine as they move in one revolution of the crankshaft
Sphere Solid having the shape of a ball (constant D)
Cone Solid with base as a circle, and sides tapered to a point
Surface Area of 3-D Solids Sum of all the areas of the faces of a solid
Polyhedrons -They have flat polygonal faces, straight edges, and sharp corners on vertices -They are based on polygons -They have no curved faces
Prisms Prisms are simple polyhedrons that have identical polygon ends and flat parallelograms sides
Pyramids Pyramids are polyhedrons with a polygon base and sides meeting at a top point or apex
Trigonometry The branch of mathematics that studies relationships involving lengths and angles of triangles.
Right Triangle A triangles that has 90 degrees
Oblique Triangle A triangle that is not a right triangle. There are two kinds of oblique triangles: Acute (all its angles are less than 90, and Obtuse triangles (has one obtuse angle).
Equilateral Triangle All its sides and angles are equal
Isosceles Triangle Two sides are equal. Angles opposite to equal sides are equal
Scalene Triangle The three angles and sides are unequal
Angle of elevation Angle produced by an object which is higher than the fixed view...
Angle of depression Angle produces by an object which is lower to the perspective view.
Created by: jfernandohv