Circles Pre-Flashcard

Front

What is the radius of a circle with a diameter of 36 ft?

Back

18 ft

Front

If the diameter of a circle is 10 cm, is the radius 5 cm?

Back

TRUE

Front

What is the formula for circumference of a circle given the diameter?

Back

C = pi x D

Front

What does 'circumference' mean?

Back

Distance around a circle

Front

If the radius of a circle is 8 cm, is the diameter 16 cm?

Back

TRUE

Front

What is the relationship between diameter and radius?

Back

Diameter = 2 x Radius

Front

What is the formula for the area of a circle?

Back

A = pi x r^2

Front

What is the diameter of a circle with a radius of 10 cm?

Back

20 cm

Front

If a circle has a circumference of 31.4 cm, what is its diameter?

Back

10 cm (using C = pi x D)

Front

What is the value of pi (π) approximately?

Back

3.14