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# IGCSE Math

🇬🇧
In English
Created: Public
Created by:
Amanda Plachy

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sin

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### Levels:

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### Questions:

78 questions
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 Formula Sin
 Formula: Cos
 Formula: Tan
 Formula: Area of a circle
 Formula: Circumference of a circle
 A = lw Area of a rectangle
 P = 2l + 2w or P = 2(l + w) Perimeter of a rectangle
 Formula: Area of a triangle
 A = bh Area of a parallelogram
 Formula: Area of a trapezium
 V = lwh Volume of a cuboid
 2lw + 2wh + 2lh (sum of the area of all the faces) Surface area of a cuboid
 Formula: Surface of a cylinder
 Formula: Volume of a cylinder
 Formula Volume of a pyramid
 Formula: Volume of a cone
 Formula: Surface area of a cone
 Formula Volume of a sphere
 Formula: Surface area of a sphere
 Formula: Sum of interior angles
 Formula: Interior angle in a regular shape
 360 degrees Sum of exterior angles
 Formulas Distance/speed/time
 Only what A and B have in common A n B (read as A intersect B)
 Everything in A AND everything in B A U B (read as A union B)
 Everything NOT in A A' (read as A complement)
 I = PRT Simple Interest
 Formula Compound Interest
 Formula: Pythagoras theorem
 1. Angle in a semicircle is 90 degrees 2. The tangent is perpendicular to the radius Circle Theorems
 Image Alternate angles
 Image Corresponding angles
 Image Vertical angles
 Always = 1 Sum of probability outcomes
 Probability of A x probability of b Probability of A and B happening
 Probability of A + probability of B Probability of A or B happening
 Measure from the north and always measure clockwise How do you measure bearings?
 Formula Multiplying indices with the same base
 Formula Dividing indices with the same base
 Formula Multiplying indices together
 Any number or letter to the 0 power = 1 Zero power
 Formula Negative indices
 Formula Percent change
 Y = y-value m = gradient/slope of the line x = x-value c = y-intercept (where the graph intersects the y-axis) What do the letters in y = mx + c represent?
 Mean The average of a set of numbers add all the numbers and divide by how many numbers there are
 Median The number in the MIDDLE of a set of data (data must be in order from least to greatest!)
 Mode The number in a set of data that occurs the MOST
 Range The difference between the smallest and largest numbers in a set of data
 Order of symmetry How many times the picture looks the EXACT same as you rotate it around
 You can only add and subtract fractions with the same... Denominator
 Gradient/slope Change in y divided by change in x the measure of how steep a line is
 Y-intercept Where the graph crosses the y-axis
 Origin The center of a coordinate plane (0,0)
 Parallel lines always have the same... Gradient/slope
 Angles in a triangle add up to... 180
 Isosceles triangle 2 sides are equal and 2 angles are equal
 Scalene triangle All three sides and angles are different
 Obtuse 90 < angle < 180
 Acute 0 < angle < 90
 Reflex angle 180 < angle < 360
 What does "make x the subject" mean? Change the equation so it's x =
 Expand Multiply what's outside the brackets with what's inside the brackets (distribute) or if it looks like (x + 2)(x + 3) then FOIL
 FOIL: what does that mean? Multiply the FIRST terms, then the OUTER terms, then the INNER terms, then the LAST terms
 Factor/factorize Take an expression and put it back into brackets, often looking for a highest common factor to "factor out"
 Highest common factor Find the largest factor two numbers have in common (factors are the numbers you multiply together to get the number)
 Least common multiple The smallest multiple two numbers have in common (multiples are the answers to a number's multiplication tables. example multiples of 5 are 5, 10, 15, 20, 25, etc.)
 Prime factorization The prime numbers that you can multiply to get a number, use a factor tree
 Rotation Turn (list angle of rotation, clockwise or counterclockwise, and the center of rotation)
 Translation Slide (list the vector x on top and y on bottom)
 Reflection Flip (list equation of mirror line y = or x =)
 Enlargement Make bigger or smaller (list scale factor-compare the side lengths, and find center of enlargement-drawing lines from each point)
 The letters x and y are going to be in your expression Write an expression in terms of x and y means..
 The largest a rounded number can be Upper bound
 The lowest a number can be Lower bound
 What does solve simultaneous equations mean? You need to find the x value and the y value that make BOTH equations true! Usually use elimination method.
 Nth term A rule for a sequence involving the letter n
 Line of best fit A line drawn with an equal number of points above and below it