circles Flashcards
1
Q
circumference
A
pi x diameter
2
Q
area
A
pi x radius squared
3
Q
diameter
A
radius x 2 or circumference divided by pi
4
Q
radius
A
diameter divided by 2 or circumference divided by pi making the diameter then divid by 2 or area divided by area and squared rooted
5
Q
circumference =cm or cm squared
A
cm
6
Q
area = cm or cm squared
A
cm squared
7
Q
what is a chord
A
a line going through the circle but not right in the middle
8
Q
what is a tangent
A
a line touching the outside of the circle
9
Q
arc length
A
angle divided by 360 x (pi x diameter/ circumference)
10
Q
area of a sector
A
angle divided by 360 x (pi x radius squared/area)
11
Q
what is a sector
A
a fraction of a circle
