The sector $AOB$ is one third of the circle. Find the length of chord $AB$. Give your answer to $1$ decimal place. [Enter the value excluding units]

$POQ$ is a sector of a circle. The angle of the sector is $75°$. Chord $PQ$ has length $8 \mathrm{cm}$. Find the radius of the circle. Give your answer to $1$ decimal place. [Enter the value excluding units]

$ROS$ is a sector of a circle of radius $5 \mathrm{cm}$. Chord $RS$ is $8 \mathrm{cm}$. Find the angle of sector $ORS$. Given your answer to $1$decimal place. [Enter the value excluding degree symbol]

Find the area and circumference of the following circle. Give your answers in terms of $\pi$.

Find the area and circumference of the following circle. Give your answers in terms of $\pi$.

Find the area and circumference of the following circle. Give your answers in terms of $\pi$.

Find the area and perimeter of the half circle. Give your answers to $2$ decimal points

Find the area and perimeter of the quarter circle. Give your answers to $2$ decimal points.

Find the length of the major arc.