Maths Formulas Flashcards by Grace Poole

Q

area of a rectangle

A

length x width

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Q

area of a parallelogram

A

base x perpendicular height

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Q

area of a triangle

A

1/2 x base x perpendicular height

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Q

area of a trapezium

A

1/2(a+b) x perpendicular height

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Q

circumference of a circle

A

pi x diameter

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Q

area of a circle

A

pi x radius squared

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Q

volume of a cylinder

A

pi x radius squared x height

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Q

sum of interior angles

A

(n-2) x 180 degrees

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Q

exterior angles add up to

A

360 degrees

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Q

one exterior angle in a REGULAR polygon adds up to

A

360 degrees/n

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Q

a pair of interior and exterior angles add up to

A

180 degrees

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Q

volume of a cuboid

A

length x width x height

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Q

volume of a prism

A

area of cross-section x length

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Q

volume of triangular prism

A

1/2 x base x perpendicular height x length

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Q

volume of pyramid

A

1/3 x area of base x height

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Q

interior angles in a triangle add up to

A

180 degrees

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Q

interior angles in a quadrilateral add up to

A

360 degrees

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Q

interior angles in a pentagon add up to

Study These Flashcards

A

540 degrees

Q

interior angles in a hexagon add up to

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A

720 degrees

Q

interior angles in an octagon add up to

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A

1080 degrees

Q

constructing pie charts

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A

angle = frequency/total x 360 degrees

Q

Z-angles

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A

Alternate angles are equal

Q

F-angles

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A

Corresponding angles are equal

Q

C-angles

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A

Co-interior angles add to 180 degrees

pythagoras theorem

a squared + b squared = c squared

trigonometry (sin)

sin(x) = opp/hyp

trigonometry (cos)

cos(x) = adj/hyp

trigonometry (tan)

tan(x) = opp/adj

speed = distance/time

D S T

density = mass/volume

M D V

area of a sector

theta/360 degrees x pi x radius squared

length of an arc

theta/360 degrees x pi x diameter

sine rule

a/sin A , b/sin B , c/sin C

cosine rule

a squared = b squared + c squared - 2bc cosA

area of a triangle ( trigonometric formulae)

1/2absinC

gradient of a line

m = y squared - y 1/ x squared - x 1

midpoint of two points

(x 1 + x 2/2, y 1 + y 2 /2)

compound growth and decay

p x (1+ r/100) -

percentage increase or decrease

new - original/original x 100

quadratic formula

x + -b square (plus or minus) squared root b squared - 4(a)(c)/2 (a)

equation of straight line

y = mx + c

perpendicular gradient

-1/m

frequency polygons

plot the midpoint and the frequency

comparing datasets

comment on the median or mean and the IQR or range