Circles (By Dario)

What is a Radius?

• The circumference is the distance around a circle.

• Radius of a circle is the distance from the center of the circle to any point on it's circumference. It is usually denoted by 'R' or 'r'.

• The Radius of a circle can be defined as the line segment joining any two points on the circumference of the circle.

• I don't know??

If the Radius of a circle is 9cm, what is the diameter?

What is the circumference?

• The circumference is the total length around the circle.

• The circumference of a circle can be defined as the line segment joining any two points on the circumference of the circle.

• It's the perimeter of the circle.

• It's the area of the circle.

Answer explanation

The circumference is the total length around the circle.

Pi is: ...(number)

Draw the radius:

Answer explanation

Here is the answer:

Draw the diameter:

Answer explanation

Here is the answer:

Draw a chord:

Answer explanation

Here is the answer:

The Formula used to find the circumference of a circle:

• 3.14 x 2 x r

• C = Pi x r2

• Pi x 2 x r

• 
• Pi x d

Answer explanation

The Formula used to find the area of a circle:

• 3.14 x 2 x r

• Pi x 2 x r

• 

Answer explanation

Find the curcumference of this circle:

• 39.94

• 3.14767362

• 55.78

• 81.64cm