Radius & Diameter
Circumference
Area
Working Backwards
Composite figures
100
What is Radius?
Radius is the distance from the centre of a circle to any point of the circle.
100
What is Circumference?
Circumference is the distance around a circle.
100
What is the formula for area of a circle?
A= pi*r2
100
A bicycle wheel has a radius of 1 foot. If the bicycle wheel rotates one time, what distance is travelled?
What is 2pi or 6.28 feet.
100
When finding the area of a composite shape (has circles and squares or triangles and rectangles, etc.), you need to find the area of all the shapes and _______.
What is add?
200
What is Diameter?
The distance across a circle measured through its centre.
200
A circle has a diameter of 3 inches. This is the circumference.
What is 9.42?
200
A circle has a diameter of 16. Find the area.
200.96
200
The circumference of a wheel is 113.04 inches. What is the radius of the wheel?
What is 18 inches?
200
Find the area to the nearest tenth.
What is 46.1 m2?
300
If I have radius, how do I find diameter?
Multiply it by 2
300
A circle has a diameter of 102.38 inches. What is the circumference?
What is 321.47 inches?
300
A circle has a radius of 50 miles. What is the area of the circle TO THE NEAREST MILE?
What is 7854 mi2.
300
If your circumference is 72.98 what is your radius?
What is 11.62?
300
Find the shaded area. Give the approximate answer.
What is 53.7 yd2?
400
The Diameter is 25 meters. What is the Radius?
The Radius is 12.5 meters.
400
A circle has a radius of 16 feet. Find the Circumference.
100.48 feet
400
A pizza is 16 inches long (diameter). It is cut into 4 pieces. Jane eats 3 of the pieces. What is the area of pizza she is eating?
What is 48 pi in2
400
John owns a circular pool in his back yard. If he swims around the pool, he swims 30pi meters. What is the radius of this circle?
What is 15 meters.
400
A figure is composed of a triangle and a semi-circle. The base of the triangle is 8 and the height is 4. The radius of the semi-circle is 6. Find the area.
What is 25.42?
500
The Radius is 81 cm. What is the Diameter?
the Diameter is 162 cm.
500
If the radius is 123.45, this is the circumference.
What is 775.266?
500
If you diameter is 7.35 what is your area?
What is 42.41?
500
A circle has a circumference of 18.84.
What is the area?
What is 28.26
500
Find the area. Give the approximate answer.
What is 122.1 cm2?