math formulas

Cards (14)

what is the formula for the area of a trapezium?
1/2 * (a+b) * h
area of a circle?
pi * r^2
for a sector of angle x... 
arc length = (x/360) * 2 * pi * r
area = (x/360) * pi * r^2
surface area of hollow cylinder is...
2 * pi * r * h
surface area of hollow can is....
(2 * pi * r * h) + pi * r^2
surface area of a hollow cone is...
pi * r * l
surface area of a sphere is...
4 pi * r^2
volume of a solid with uniform cross section is...
area of end * height
volume of a sphere
(4/3)*pi*r^3
Rotational symmetry of order 2 means that if you rate the shape about its center through one complete turn, it will fit onto itself twice.
Sum of interior angles in an N- sided polygon is?
(n-2)*180
in a regular n sided polygon, where all sides are qual and angles are the same, exterior angle is?
360/n
in a regular n sided polygon, where all sides are qual and angles are the same, interior angle is?
180-(360/n)
in quadratic sequence, the coefficient of n2 is always half the term by term rule in 2nd diff