6. In the figure, the perimeter of sector AOB with centre O is 70 cm.
Find the value of r.
(Give your answer correct to 3 significant figures.)

What is the radius of a circle with an area of 78.5 cubic inches? use 3.14 for pie

The angle of elevation from point a to the top of the cliff is 38 degrees. if point a is 80 feet from the base of the cliff , how high is the cliff ?

Identify all the cases where non-probability sampling is used when attempting to study the characteristics of a large city. studies on every subject in the population divide a population in groups and obtain a sample studies with a limited amount of time demonstrate existing traits in a population studies with the nth person selected