Formulas Flashcards
(19 cards)
How do you find the Nth term of a geometric sequence?
Nth Term = ar^(๐โ1)
What is the (a) and the (r) in the Nth term of a geometric sequence?
The (a) is the number at the beginning of the sequence. The (r) is the common ratio (the amount each number is multiplied).
How to find the percentage change in values?
% change =(difference in value รท original value) x 100
How do you find the Circumference of a circle?
C = ๐ x d
How do you find the Diameter of a circle?
D = 2 x r
How do you find the Area of a circle?
Area = ๐r^2
How do you find the Volume of a cuboid?
Volume = Length x Width x Height
How do you find the Volume of a prism?
Volume = Area of a Cross-Section x Depth
How do you find the Area of a cross-section?
Area of a Cross-Section = ๐ x r^2
How do you find the sum of the Interior angles of a polygon?
(n - 2) x 180ยฐ (n being the number of sides)
How do you find the Gradient of a line?
Gradient = Up รท Along
How do you find the Area of a trapezium?
Half the sum of the parallel sides, then times the distance between them.
What is the sum of the Interior Angles in quadrilaterals?
The total is 360ยฐ.
What is the Perimeter of a semi-circle?
1/2 Circumference + Diameter
How do you find the Volume of a sphere?
V = 4/3 x ๐ x r^3
What is โ๐ x โ๐
โ๐ x โ๐ = a
what is wrong with this: 7/โ๐
The bottom number is a surd, so we have to convert it into an integer.
What is the Pythagoras Theorem?
a^2 + b^2 = c^2
How do we find a missing Perimeter of a triangle?
We find the missing side with the Pythagoras Theorem.
