Understanding Circles: Radius and Diameter Flashcard

Front

What is the formula to calculate the circumference of a circle?

Back

Circumference = Diameter × 3.14

Front

If the radius of a circle is 7 meters, what is the diameter?

Back

Diameter = 2 × Radius = 14 meters

Front

What is the relationship between radius and diameter?

Back

Diameter = 2 × Radius

Front

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

Back

Radius = Diameter ÷ 2 = 5 cm

Front

What is the diameter of a circle with a radius of 8 cm?

Back

Diameter = 2 × Radius = 16 cm

Front

What is the value of π (pi) approximately?

Back

π (pi) ≈ 3.14

Front

How do you convert diameter to radius?

Back

Radius = Diameter ÷ 2

Front

What is the diameter of a circle if its circumference is 31.4 cm?

Back

Diameter = Circumference ÷ π = 10 cm

Front

If a circle has a diameter of 12 cm, what is its circumference?

Back

Circumference = Diameter × π = 12 cm × 3.14 = 37.68 cm

Front

What is the radius of a circle with a diameter of 16 cm?

Back

Radius = Diameter ÷ 2 = 8 cm