geometry formulas 2d shapes Flashcards
1
Q
circle 1/5
area of a circle
A
area= pie times radious to the 2nd power
pie r squared
a= 3.14 r^2
2
Q
area of a square
A
L * w
3
Q
volume
A
L * w * h
4
Q
radious of cicle (1/2)
circle 1/5
how to find the radious of circle when you already know the circumference
A
r = c / (2 * π) .
radious= circumferece divided by 2 * 3.14
pie times 2 divided by circumference
5
Q
how to find area of triangle
A
a= b * h / 2
area= base times height divided by 2
6
Q
circle 3/5
circumference of circle
A
c=πd
circumference = 3.14 * diameter
diameter times pie
6
Q
cirlce 4/5
diamter of circle
A
2r=d
radius times 2 = the diamter
7
Q
radius (2/2)
cirlce 5/5
radious of circle when you know area
A
r = √(A / π)
radius = area divided by 3.14 then you square root it
area divided by pie then square root it
