Equations

Question 1

Interior angle of regular polygon

Answer 1

(No. Sides - 2) x 180 over no. Sides

Question 2

Exterior angle of regular polygon

Answer 2

360/ no. sidess

Question 3

Volume of sphere

Answer 3

4/3 pieR3

Question 4

Surface area of sphere

Answer 4

4pieR2

Question 5

Volume of cone

Answer 5

1/3 pieR2 x h

Question 6

Volume of pyramid

Answer 6

1/3 x area of base x vertical height

Question 7

Depreciation

Answer 7

New value = original x (1- percentage/100)time

Question 8

Percentage of amount

Answer 8

Percentage/100 x amount

Question 9

Percentage change

Answer 9

Percentage change= new-original/original x 100

Question 10

Histograms

Answer 10

Frequency density= frequency/ class width

Question 11

Gradient

Answer 11

Change in y/change in x = y2-y1/x2 x x1

Question 12

Equation of a straight line

Answer 12

Y = mx + c

Question 13

Quadratic graphs

Answer 13

Ax2 + Bx + C

Question 14

Cubic graphs

Answer 14

Ax3 + Bx2 + Cx + D

Question 15

Reciprocal graphs

Answer 15

Y= k/x

Question 16

Exponential graphs

Answer 16

Y=k(to the power of)x

Question 17

Circle graphs

Answer 17

x2 + y2 = r2

Question 18

Describe Sin graph

Answer 18

Peak 1 at 90, minimum is -1 at 270, cross axis at 0, 180, 360

Question 19

Describe Cosine graph

Answer 19

Peak 1 at 0 and 360, minimum -1 at 180, crosses axis at 90 and 270

Question 20

Describe Tangent graphs

Answer 20

Crosses axis once at origin, angle gets big and close to 90, other end gets small and close to -90, never touches line

Question 21

Sin graph equation

Answer 21

y= Sin x between 0 and 360

Question 22

Cosine graph equation

Answer 22

y = cos x between 0 and 360

Question 23

Tangent graph equation

Answer 23

y = tan x between -90 and 90