Formulas

Question 1

How do you find the Nth term of a geometric sequence?

Answer 1

Nth Term = ar^(𝑛−1)

Question 2

What is the (a) and the (r) in the Nth term of a geometric sequence?

Answer 2

The (a) is the number at the beginning of the sequence. The (r) is the common ratio (the amount each number is multiplied).

Question 3

How to find the percentage change in values?

Answer 3

% change =(difference in value ÷ original value) x 100

Question 4

How do you find the Circumference of a circle?

Answer 4

C = 𝜋 x d

Question 5

How do you find the Diameter of a circle?

Answer 5

D = 2 x r

Question 6

How do you find the Area of a circle?

Answer 6

Area = 𝜋r^2

Question 7

How do you find the Volume of a cuboid?

Answer 7

Volume = Length x Width x Height

Question 8

How do you find the Volume of a prism?

Answer 8

Volume = Area of a Cross-Section x Depth

Question 9

How do you find the Area of a cross-section?

Answer 9

Area of a Cross-Section = 𝜋 x r^2

Question 10

How do you find the sum of the Interior angles of a polygon?

Answer 10

(n - 2) x 180° (n being the number of sides)

Question 11

How do you find the Gradient of a line?

Answer 11

Gradient = Up ÷ Along

Question 12

How do you find the Area of a trapezium?

Answer 12

Half the sum of the parallel sides, then times the distance between them.

Question 13

What is the sum of the Interior Angles in quadrilaterals?

Answer 13

The total is 360°.

Question 14

What is the Perimeter of a semi-circle?

Answer 14

1/2 Circumference + Diameter

Question 15

How do you find the Volume of a sphere?

Answer 15

V = 4/3 x 𝜋 x r^3

Question 16

What is √𝑎 x √𝑎

Answer 16

√𝑎 x √𝑎 = a

Question 17

what is wrong with this: 7/√𝑎

Answer 17

The bottom number is a surd, so we have to convert it into an integer.

Question 18

What is the Pythagoras Theorem?

Answer 18

a^2 + b^2 = c^2

Question 19

How do we find a missing Perimeter of a triangle?

Answer 19

We find the missing side with the Pythagoras Theorem.