Diameter of a Circle
This is the formula used to find the diameter of a circle.
What is d = 2r?
When given the diameter, we use this operation to find the radius.
This is the formula used to find the Circumference of a Circle.
What is C=(pi)d
This is the formula for finding the area of a circle.
Moosa won the student/teacher team badminton tournament (in his dreams) and received the highly sought after CHAMPIONSHIP trophy. The trophy has a diameter of 15 inches across. This is the circumference of the trophy that Moosa has won....in his dreams.
What is 47.1 inches?
A circle has a radius of 24.5 cm. This is the diameter.
What is 49 cm?
A circular ferris wheel has a diameter of 210 metres. This is the radius.
What is 105 metres?
The radius of my favourite cereal bowl is 24 cm. This is the circumference.
What is 150.72 cm?
I installed a new circular swimming pool but need to buy a pool cover to protect it. The radius of my pool is 14 feet. This is the area of the pool cover that I will need in order to cover the entire thing.
What is 615.44 feet2?
Callum scored the game winning goal for his hockey team last night. His coach gave him the puck to keep. The puck has a radius of 42 mm. This is the total area of the puck that Callum will need to make room for on his bedroom shelf.
What is 5538.96 mm2?
I am installing a circular pool with a radius of 42.63 metres. This will be the distance for me to swim from one end to the other.
What is 85.26 cm?
A circular swimming pool is 150 feet from one side to another. I have to swim this many feet to reach the centre from the edge.
What is 75 feet?
My teacher is terrible at drawing. This is the tool she uses to draw a perfect circle every time.
What is a compass?
My dinner plate, filled with poutine and a delicious juicy burger, has a radius of 15 inches. This is the area and the amount of space I have to fit more yummy food.
What is 706.5 in2?
Zainab K. is trying out a new Henna design that involves polka dots of varying sizes all over your hands. Her largest polka dot has a diameter of 116.78 cm. This is the circumference of the largest polka dot.
What is 366.69 cm?
This is the diameter of a circular sand box with a radius of 113.58 inches.
What is 227.16 inches?
The diameter of a circle is 65.34 cm. This is the radius.
What is 32.67 cm?
A smartie has a diameter of 16 mm. This is the circumference.
What is 50.24 mm?
My friend lives in a high rise condo building. Here dog has a circular "pee pad" that he uses on their balcony instead of going downstairs to the grass. The pee pad has a diameter of 210 cm. This is the area of the pee pad for him to do his business on.
What is 34618.5 cm2?
Abhir has found a magical pokemon card that is worth hundreds of dollars. Brett steals it and uses it for Math class to cut out a circle with a radius of 4 cm2. Abhir rages uncontrollably as he examines the damage that Brett has done. Abhir's rage is 2 times this area of the circle that Brett cut out.
What is 1607.68 cm2?
Diameter is used in this other formula for circles that we have learned.
What is Circumference?
Radius is used as part of this formula for circles.
What is Area?
Rapunzel wants to put some LED lights all around the top of her circular tower's ceiling. The radius of her tower ceiling is 56 inches. She will need this length of LED light strips to wrap all the way around her ceiling so that she can rock out.
What is 351.68 inches?
Zoya is competing for "world's greatest fence jumper" at the AJM Olympics. The champion receives a medal with a radius of 39.54 mm. This is the area of the medal that Zoya will win and wear proudly for all of her friends to see.
What is 4909.11 mm2?
Mme. Park purchased a rare pair of Harry Potter glasses for $800. The diameter of one lens is 48 cm. This is the circumference and area of each lens.
What is C = 150.72 cm and A=1808.64 cm2?