segment

sector

circular region

major segment

area of the circle

perimeter of the circle

perimeter of the semicircle

area of the semicircle

area of the half of the circle

area of the quadrant of the circle

area of three quadrant of the circle

area of the circle

length of arc of the circle

area of sector of the circle

area of segment of the circle

area of semicircle

$\frac{3}{4}\times r\times length\ of\ arc$

$\frac{1}{2}\times r\times length\ of\ arc$

$\frac{1}{4}\times r\times length\ of\ arc$

$\frac{1}{3}\times r\times length\ of\ arc$

Area of circle - area of sector

Area of sector - area of circle

Area of triangle - area of sector

Area of sector - area of triangle

semicircle of the circle

circumference of the circle

segment of the circle

area of the circle

 $2\pi r$  

 $2\pi r^2$  

 $\pi d$  

 $\pi r^2$  

$\pi r^2$

$\pi r$

$2\pi r$

$\pi r+d$

 $\frac{C}{d}$  

 $\frac{C}{2d}$  

 $\frac{C}{r}$  

 $\frac{A}{C}$  

Major chord

diameter

Circumference

Major arc

sector of circle

segment of circle

an arc of circle

chord of circle