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Circle

Study Slideshow

What shape is this?

It's circle

What's point A?

Centre

What is AB?

Radius

What is BC?

Diameter

What is the radius?

5cm

Radius = 7, Diameter = ?

Diameter = 10, Radius = ?

What kind of number π is?

It is an irrational number. It connects the circumference of a circle with the radius

What is circumference of a circle?

The circumference of a circle is the linear distance of the circle's edge

What is the formula that connects the circumference of a circle with the radius?

C=2πr

What is the formula that connects the circumference of a circle with the diameter?

C=πd

The radius of a circle is 3.5 mm, what is the circumference of this circle?

≈ 22 mm

The diameter of a circle is 7 km, what is the circumference of this circle?

≈ 22 km

The circumference of a circle is 66 m. What is the diameter?

≈ 21 m

Is there a way to connect the diameter with the area of a circle?

Yes, there is

What is the formula to connect the diameter with the area of a circle?

A = π (d/2)^2