formulae????? Flashcards
what is the volume of a sphere?
v=4/3πr^3
surface area of a sphere?
a=4πr^2
volume of a cone?
v=1/3πr^2h
surface area of a cone?
a=πr^2+πrl
(l= slanted length)
what is a radian?
a radon is when the arc length is equal to the radius.
360 degrees in radians
2π radians
180 degrees in radians
π radians
90 degrees in radians
π/2 radians
how can the midpoint and distance be found between 2 3D coordinates?
midpoint= (x1+x2 )/2,(y1+y2 )/2,(z1+z2 )/2
distance= √ [(x2 – x1)2 + (y2 – y1)2 + (z2 – z1)2]
what is the trigonometric ratio of sin45
1/√2= √2/2
what is the trigonometric ratio of cos45
1/√2= √2/2
what is the trigonometric ratio of tan45
1
what is the trigonometric ratio of sin30
1/2
what is the trigonometric ratio of cos30
√3/2
what is the trigonometric ratio of tan30
1/√3= √3/3
what is the trigonometric ratio of sin60
√3/2
what is the trigonometric ratio of cos60
1/2
what is the trigonometric ratio of tan60
