Area of a disc and its parts
Answers are for parents and teachers.
1
What is the area of a disc of radius 12 cm?
144π cm²
2
What is the area of a 150° sector of a disc of radius 12?
60π
3
What is the area of an annulus with outer radius 10 and inner radius 6?
64π
4
What is the area of the segment cut off by a 90° arc in a disc of radius 8?
16π − 32
5
Why does a sector have area S = ½Rl?
S = πR²n/360 and l = πRn/180, so S = ½R·l.