Maths Chapters 3.5,3.6,4,5 Nov 2017 Flashcards
What is the sum of all exterior angles?
360
Alternate angles are ……
Equal
What equation do you use to find the interior angles of any polygon?
(n - 2) x 180
Straight lines are …… degrees
180
How do you find the mean?
Add up all numbers and divide by the amount of numbers
How do you find the mode?
Find the most common number
How do you find the median?
Arrange the numbers into size order and choose the middle number ( if there are two numbers in the middle add them together and divide by 2)
What is the three letter pneumonic for dividing fractions?
KFC ( keep, flip, change)
e.g. 14/5 divided by 10/7 = 14/5 times by 7/10 = 98/50 Now simplify
You have 150 doughnuts. You need to split them into the ratio 1:10:4 between you and your friends Tim and Tom. How many doughnuts does Tim get?
1 + 10 + 4 = 15
150/15 = 10
10 x 10 = 100
Tim gets 100 doughnuts
What are the three trigonometry words?
Sin, Cos and Tan
What two factors do you need when using Sin?
The opposite and hypotenuse
What two factors do you need when using Cos?
The adjacent and hypotenuse
What two factors do you need when using Tan?
The opposite and adjacent
A game on steam is on a 25% sale. It now costs £54. What was its original price?
£54 = 75%
54 divided by 3 = 18 (25%)
18 x 4 = £72 (25% x 4 = 100%)
What is the equation for Pythagoras’ theorem?
A squared + B squared = C squared
