Key Terms
Formulas
Working Backwords
Word Problems
About Phinn
100

What is the radius of a circle?

A line that goes from one point of the circle to the middle.

100

What are the two formulas for solving circumference?

2πr or dπ

100

My circle has a circumference of 20 centimetres. What is the diameter?

The diameter is 6.369 centimetres.

100

Chloe's pan has a radius of 2 inches. What is the diameter of her pan?

The diameter of her pan is 4 inches.

100

What are my favourite artists (2)?

Harry Styles and Taylor Swift

200

What is the diameter?

A line that crosses from one end of the circle through the middle.

200

What is the formula for solving the area?

πr^2 
200

My circle has a circumference of 20 centimetres. What is the radius?

The radius is 3.184 centimetres.

200

Abby wants to split her cookie evenly with Phinn. If the diameter of the cookie is 30 millimetres, how much of the cookie would Phinn get?   

Phinn would get 353.25 square millimetres of the cookie.

200

What is my favourite color?

Purple

300

What is the circumference?

The full length around the circle.

300

If you know the diameter what do you need to do to figure out the radius?  

Divide the diameter by two.

300

My circle has a circumference of 1,234,567,890 inches. What is that diameter?

The diameter is 393,174,487.261 inches.

300

Milo's circular garden has a radius of 5 feet. He wants every square foot to be covered in roses. How many square feet of roses will he need?

Milo will need 78.5 square feet.

300

What is my favourite movie series?

The Hunger Games

400

What is a chord?

A line that crosses from one part of the circle to the other without going through the middle.

400

How do you get the diameter from the circumference?

C÷π

400

My circle has a circumference of 24 feet. What is the radius? 

The radius is 7.643 feet.

400

Grace's smartie has a radius of 4 millimetres. Defne's smartie has a diameter of 10 millimetres. Who's smartie is bigger?

Defne's smartie is bigger.

400

What are my go-to stores (3)?

Under Armour, American Eagle and H&M

500

What do you use to construct a circle?

A compass.

500

How do you get the radius from the circumference?

(C÷3.14)÷2

500

The circumference of my circle is 69 inches. What is that diameter? What is the radius? 

Diameter: 21.974 inches

Radius: 10.987 inches

500

Ben wants to paint his table white. How much paint will he need if his table has a radius of 5 feet?

Ben will need enough paint to paint 78.5 square feet.

500

What are my 2 dogs' names?

Chewie and Frankie