yr 9 math Flashcards by Sara Schravemade

Q

what is the coefficient of 2x

A

2

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Q

what method do we use to make algebra easier

A

build Up and Solve

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Q

remember with word questions you must -

A

Read the question

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Q

word problems need -

A

therefore

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Q

step 1 -

A

read the question

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Q

step 2 -

A

re-read and highlight key details

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Q

step 3 -

A

identify the unknown

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Q

step 4 -

A

make a formula with the unknown

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Q

step 5 -

A

solve with BU and S

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Q

step 6 -

A

right brief answer (therefore)

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Q

step 7 -

A

can check with substitution

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Q

what is the opposite of squared?

A

square root

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Q

what is the formula for surds?

A

√ab = √a x √b

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Q

when can surds be added or subtracted?

A

if they are ‘like terms’

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Q

divisible by 2 when -

A

last digit is even

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Q

divisible by 5 when -

A

last digit is 0 or 5

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Q

divisible by 10 when -

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A

last digit is 0

Q

divisible by 3 when -

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A

if the sum of its digits is divisible by 3

Q

divisible by 4 when -

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A

if its last 2 digits are divisible by 4

Q

divisible by 9 when -

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A

if the sum of it’s digits are divisible by 9

Q

what is the hypotenuse?

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A

the longest side opposite the 90 degrees

Q

what is Pythagoras theorem formula?

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A

a2 + b2 = c2

Q

what is a Pythagorean triple or triad?

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A

a set of three numbers that satisfy the Pythagoras theorem

Q

Triad examples -

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A

3,4,5 5,12,13

trigonometry note -

Some Old Hags Cant Always Hide Their Old Age

formular for sin

sin 0 = opp/hyp

formular for cos

cos 0 = adj/hyp

formular for tan

tan 0 = opp/adj

what happen when you divide sin, cos and tan

sin-1, cos-1, tan-1

when do we divide sin, cos and tan?

when we are finding the angle

what is the subtopic of trigonometry?

angles of elevation and depression

what is perimeter?

the distance an ant would walk around a 2D shape

what do you do to figure out a quarter or a half of a circle with perimeter or area?

find out the perimeter or area and divide by 1/4 or 1/2

what is surface area?

its the total area of all of a 3D shapes faces

TSA -

total surface area

CSA -

curved surface area

SA -

surface area

what is volume?

the amount of space a 3D shape occupies (in cubic units)

what is capacity?

the amount a 3D shape can hold (in cubic units)

A -

area

H -

height

what do you do when working backward?

rearrange the formula