all formulars for GCSE Maths Flashcards
What is the area of an rectangle?
length x width
What is the area of an triangle?
1/2 x base x height
or
1/2absinC (for non right angle triangle)
What is area of trapezium?
1/2 x (a+b) x height
What is the Area of Parallelogram?
base x height
Area of circle?
pi x radius squared
Circumference of circle?
pi x diameter
volume of prism?
area of cross section x length
volume of cylinder?
pi x radius squared x height
Pythagoras theorem?
a squared + b squared = c squared
trigonometric ratios?
SOH,CAH,TOA
HOW TO FIND DENSITY?
MASS DIVIDED BY VOLUME
How to find speed?
DISTANCE DIVIVDED BY TIME
how to find pressure?
force divided by area
volume of pyramids?
1/3 x area of base x height
the quadratic equation?
-b+/- square root b squared - 4ac over 2a
What is the sine rule?
(to work out lengths)
a/sinA = b/sinB = C/sinC
A=ANGLE
a=LENGTH
used for triangles especially non right angle triangles
What is the sine rule?
(to work out angles)
sinA/a = sinB/b = sinC/c
used for triangles especially non right angle triangles
What is the cosine rule?
a squared = b squared + c squared - 2bcCosA
USE for non-right angled triangles different from sine rule because used when they is no two pairs of angle and length.
Area of triangle?
used when you cant find the height of the triangle
1/2 x a x b x Sin x C
What is the area of an sector?
pi x radius squared x theta/360
what is direct proportion?
x=Ky squared
Where x is directly proportional to y squared.
What is Inverse proportion?
x=k/y squared
Frequency Density?
frequency/class width
the equation of a straight line ?
y=mx+c
m=gradient
c=y-intercept
how to find gradient of an line?
Y2-Y1/X2-X1
surface area of a sphere?
4 pie radius squared
surface area of a cube?
6 area squared
surface area of cylinder?
2 pi squared + 2 pi radius height
How to find total interior angle in a polygon?
180(n-2) = total interior angle
to find single interior angle divide the total by how many sides there are in the polygon.
