Circles Flashcards
1
Q
What is the formula to work out the area of a circle?
A
πr²
2
Q
What is the formula to work out the Circumference of a circle?
A
C=πd
3
Q
What is the formula to work out the Area of a sector?
A
X/360 πr²
4
Q
What is the formula to work out the Circumference of a arc?
A
X/360 πD
5
Q
What is the radius if the diameter is 10cm?
A
5cm (10/2)
6
Q
What is the formula to work out the Circumference of a semi-circle?
A
C=1/2πd+(r*2)
7
Q
What is the formula to work out the area of a semi-circle?
A
1/2πr²
