7th Grade Intro Circles

Front

What number are we using as pi?

Back

3.14

Front

To go from diameter to radius, what do I need to do?

Back

Divide by 2

Front

What is the diameter of a circle when radius is 24 m?

Back

48 m

Front

What does 'circumference' mean?

Back

Distance around a circle

Front

A circular swimming pool is 21 feet in diameter. How many feet around is the pool?

Back

65.94 ft

Front

What is the formula for the circumference of a circle?

Back

C = πd or C = 2πr

Front

If the radius of a circle is 10 cm, what is the diameter?

Back

20 cm

Front

What is the area of a circle with a radius of 5 cm?

Back

78.5 cm² (Area = πr²)

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 × Radius

Front

How do you find the radius if you know the circumference?

Back

Radius = Circumference / (2π)