Calculating Circle Measurements: Area, Circumference, Radius, and Diameter

This video tutorial covers the basic properties of a circle, including the radius and diameter. It explains how to calculate the area and circumference using formulas involving pi. The video provides several example problems, demonstrating how to find the area and circumference given different circle measurements, such as radius, diameter, and circumference. The tutorial emphasizes the use of approximate values for pi and includes step-by-step solutions to enhance understanding.

What is the diameter of a circle if its radius is 4 units?

• 2 units

• 8 units

• 4 units

• 16 units

What is the relationship between the diameter and radius of a circle?

• Diameter is twice the radius

• Diameter is half the radius

• No specific relationship

• Radius is twice the diameter

What formula is used to calculate the area of a circle?

• 2r

• πr^2

• πr

• 2πr

How do you calculate the circumference of a circle?

• πr^2

• 2πr

• r/π

• πd

If the radius of a circle is 7 units, what is its circumference using π = 3.14?

• 88.0 units

• 22.0 units

• 43.96 units

• 44.0 units

What is the area of a circle with a diameter of 14 inches using π = 3.14?

• 153.86 square inches

• 154 square inches

• 78.5 square inches

• 314 square inches

How do you find the radius of a circle given its area is 28.5 square units and π = 3.14?

• 3.01 units

• 5.67 units

• 2.14 units

• 4.5 units

What is the diameter of a circle if its circumference is 14.5 feet?

• 2.31 feet

• 9.24 feet

• 7.25 feet

• 4.62 feet

Given the circumference of a circle is 18π meters, what is its area?

• 254 square meters

• 9π square meters

• 36π square meters

• 81π square meters

If a circle's area is 100 square yards, what is its circumference?

• 35.4 yards

• 100 yards

• 62.8 yards

• 50 yards