Circle information
Circumference
Area
Circle Area
Others
100
What is the distance called that stretches the inside width of the circle, crossing through the center?
Diameter
100
What does circumference mean?
the distance around a circle
100
What is the equation for the area of a circle?
A = pi x r x r OR A = pi x r2
100
If a circle has an area of 78.54m2, what is the radius?
5m
100
what is the area of a circle with a 2.4 cm radius? (to the nearest tenth)
A=3.14x 2.4 x2.4 A=18.1cm2
200
What is the distance from the center of the circle to the outer edge called?
radius
200
What is the equation for circumference?
C=pi x d OR C = 2 x pi x r
200
If you have a circular mirror with a radius of 20cm, what is its area correct to 1 decimal point?
A = 1256.6 cm2
200
What is the area of a semi-circle with a radius of 12m to the nearest meter squared?
226m2
200
True or False: If the radius of a circle is doubled, then the circumference is also doubled?
Always true
300
What is the equation for finding the diameter?
2 x r
300
What is the circumference of a circle if it has a diameter of 5.2 m to 2 decimal places?
16.34 m
300
A circle has a diameter of 25cm. What is it's area?(2 decimal places)
490.87cm2
300
What is the diameter of a circle with an area of 829.58m2
33m
300
What is the value of the circumference of ANY circle divided by it's diameter?
3.1415...... (pi)
400
What is the equation for finding the radius if you have the diameter?
radius= d รท 2
400
If you are given a radius of 6cm, what is the circumference to 1 decimal place?
37.7cm
400
The area of a semi-circle with a diameter of 6 correct to 2 dp is?
answer: 14.14 units squared
400
What is the radius of a quadrant with an area of 8.04cm2 to the nearest 10th
6.4cm
400
What is the name we use for the amount of space covered by a 2-D shape?
And find this if you have a circle with a radius of 7.4cm.
Amount of space covered by a 2-D shape = AREA
Area of circle =172.03 cm2
500
What is the radius of a circle with a diameter of 95m?
47.5 m
500
What is the circumference of a circle that has a radius of 132 mm? (round to nearest hundredth)
828.38 mm
500
14 metres of fencing is used to separate a circular enclosure in half. What is the area of the circle? (to the nearest square metre)
A = 154 meters squared
500
What is the area of an annulus (donut shape) that has a smaller circle radius of 5.13cm and a larger circle diameter of 12.5cm?
40.04m2
500
The outer ring of the Canadian Toonie (coin) has an outside diameter of 28mm and an inside diameter of 8mm. What is the area of the outer ring to the nearest mm2?
565mm2