A-Z PROJECT Heesoo Hwang

A Angles Angle The amount of turn between two straight lines that have a common end point (the vertex). Angles are various, usually devide as acute, obtuse and right angles.

B Bisects To divide into two equal parts. You can bisect lines, angles, and more. The dividing line is called the "bisector" The red line bisects the blue line. (The length of two bisected lines are the same.)

C A number used to multiply a variable. Example: 6z means 6 times z, and "z" is a variable, so 6 is a coefficient. Sometimes a letter stands in for the number. Example: In ax2 + bx + c, "x" is a variable, and "a" and "b" are coefficients. Coefficient

D Denominator The bottom number in a fraction is the denominator. It shows how many equal parts the item is divided into.

E An equation means that two things are equal., so needs an equals sign "=". 3x+2=7-1 That equation means what is on the left 3x+2 is equal to what is on the right 7-1 So an equation is a statement which says "this equals that". Equation

F Fraction A number written with a numerator and a denominator, in which both are natural numbers. the bottom number denominator shows how many parts the number or the object is divided into the top number numerator shows how many parts we have.

G Graph A diagram of values, usually shown as lines or bars. The lines contain their own equations and to get the equation you can adopt T-charts.

H Hypot The oblique side of the right triangle, it is the longgest side in a right triangle. Generally in equation it is written as "c".

I Inequality An inequality says that two values are not equal. a ≠ b says that a is not equal to b There are other special symbols that show in what way things are not equal. a < b says that a is less than b a > b says that a is greater than b (those two are known as strict inequality) a ≤ b means that a is less than or equal to b a ≥ b means that a is greater than or equal to b.

J Jump strategy Jumping by parts of a number to solve a calculation. For example: =

K Kilometers Killlmeter is a measure unite. A Metric measure of distance. Equal to 1,000 meters. The abbreviation is km. Example: it takes about 12 minutes to walk 1 km 1 kilometer = 0.6 miles approximately. Example: 60 miles is about 100 kilometers

L An equation that makes a straight line when it is graphed. Often written in the form: y = mx+b Linear equation

M Multiply Multiply is what we call "times" in our life. The basic idea of multiplying is repeated addition. For example: 5 × 3 = = 15 But as well as multiplying by whole numbers, you can also multiply by fractions or decimals. For example 5 × 3½ = (half of 5) = 17.5

N Negative Less than zero. (Positive means more than zero. Zero is neither negative nor positive.) A negative number is written with a minus sign in front Example: −5 is negative five. Negative is sometimes abbreviated "−ve" Negative

O Obtuse angle An obtuse angle is one which is more than 90° but less than 180° In other words, it is between a right angle and a straight angle.

P Perpendicular Right angle(90), two lines that form right angles are perpendicular, also we draw a small square on the right angles, it is an easy wasy to write "right angle"

Q Quantity How much there is of something. Example: What is the quantity of this apple? You could say "a bagful", or you could even count them "4262"

R Radious The distance from the centre to the edge of a circle It is half of the circle's diameter. A circle has unlimited amount of radious and all the radious in one circle are the same.

S The ratio of the length in a drawing (or model) to the length of the real thing Example: in the drawing anything with the size of "1" would have a size of "10" in the real world, so a measurement of 150mm on the drawing would be 1500mm on the real train Scale

T Tangent A line that just touches a curve at one point, without cutting across it. On the right is a tangent to an ellipse: And below is a tangent to a circle The radious to tangent is perpendicular.

U Units How many ones. How many single items. Used to show the "ones" place value (units, tens, hundreds, etc) Example: 327 has three hundreds, two tens and 7 units. (Can also mean "Unit of Measurement")

V Volume The amount of 3-dimensional space an object occupies. Capacity. For this example the volume is 4×5×10 = 200 units3 Units of volume include: Metric: cubic centimetres (cm3), cubic metres (m3), litres US Standard: fluid ounce, cubic inch, cubic foot, pints, gallons

W The distance from side to side. Example: the width of this door is 80 cm. Width

X X-axis The line on a graph that runs horizontally (left-right) through zero. It is used as a reference line so you can measure from it.

Y Y-axis The line on a graph that runs vertically (up-down) through zero. It is used as a reference line so you can measure from it.

Z Zero pair When you have to isolate the value (x) in the equation, use zero pair. For example: x+1=3, subtract 1 on the both sides. (due to the equation rule.) You will get x+1-1=3-1 X=2

Thank you