Random Mix

Question 1

Formula for frustums

Answer 1

V=1/3πr2h

Question 2

Pythagoras Theorem

Answer 2

H2=A2+B2

Then square root.

Question 3

SOHCAHTOA with angles

Answer 3

sin -1
cos - 1
tan - 1

Question 4

SOHCAHTOA with length.

Answer 4

sin x
cos x
tan x

Question 5

formula for straight line

Answer 5

y=mx+c

Question 6

working out gradient

Answer 6

y2-y1

x2-x1

Question 7

Formula for frequency.

Answer 7

frequency density x class width

Question 8

Formula for frequency density.

Answer 8

frequency density = frequency/class width

Question 9

How to draw a histogram.

For the mean

Answer 9

frequency density along the side, other measure on the bottom. Area of the bar must equal the frequency.

Add a midpoint column. Frequency midpoint column (frequency x midpoint) divide the total of the frequency midpoint column by the total frequency column.

Question 10

What is cumulative frequency?

Answer 10

Running total of frequencies. Column worked out by adding the 2 previous frequencies.

Question 11

LQ
UQ
Median
Interquartile

Answer 11

1/4
3/4
Middle value
UQ - LQ

Question 12

what is direct proportion

Answer 12

as one thing increases so does the other
y ∝ x
y = kx where k is the constant of proportionality.

Question 13

what is inverse proportion

Answer 13

as one value increases the other decreases.
y ∝ 1/x
y = k/x xy = k

Question 14

completing a square

Answer 14

square root of end number

half of middle number

Question 15

solving quadratic equations

Answer 15

x to make end number

+ to make number with x

Question 16

What is a congruent shape?

What are the congruent conditions?

Answer 16

Shapes that are exactly the same size and shape.

SAS. SSS. AAS.

Question 17

What is a similar shape?

What are the similar conditions?

Answer 17

Shapes that are the same shape but different sizes. Can be different orientations.
SSS. AAA. SAS.

Question 18

what does a shaded circe mean

Answer 18

equal to.

Question 19

what does an empty circle show

Answer 19

the number is not included

Question 20

what does a solid line mean

Answer 20

less than or equal to / greater than or equal too

Question 21

What do distance - time graphs show

Answer 21

How far an object has travelled within a given time. Steeper the gradient faster it travels. Curved graph shows speed is changing accelerating / decelerating. Horizontal means stationary.

Question 22

What do parallel lines have in common?

Answer 22

They have the same gradient.

Question 23

Why are lines perpendicular?

Answer 23

If the angle of intersection is 90 degrees. The gradient of 1 line is negative resiprocal to its perpendicular line.

Question 24

Formula for exterior angles.

Answer 24

exterior angles add to 360

so each angle is 360/n

Question 25

What do interior and exterior angles add up to

Answer 25

180

Question 26

Formula for interior angles.

Answer 26

(n-2) x 180
so each is
(n-2) x 180 / n