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A circle has a radius of 3 cm. What is the diameter in millimeters? (2023)

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Question: A circle has a radius of 3 cm. What is the diameter in millimeters? (2023)

Options:

  1. 30 mm
  2. 60 mm
  3. 90 mm
  4. 120 mm

Correct Answer: 30 mm

Exam Year: 2023

Solution: 

Diameter = 2 * radius = 2 * 3 cm = 6 cm = 60 mm.

A circle has a radius of 3 cm. What is the diameter in millimeters? (2023)

Practice Questions

Q1
A circle has a radius of 3 cm. What is the diameter in millimeters? (2023)
  1. 30 mm
  2. 60 mm
  3. 90 mm
  4. 120 mm

Questions & Step-by-Step Solutions

A circle has a radius of 3 cm. What is the diameter in millimeters? (2023)
  • Step 1: Understand that the radius of the circle is given as 3 cm.
  • Step 2: Recall that the diameter of a circle is twice the radius.
  • Step 3: Calculate the diameter by multiplying the radius by 2: 2 * 3 cm = 6 cm.
  • Step 4: Convert the diameter from centimeters to millimeters. Since 1 cm = 10 mm, multiply 6 cm by 10: 6 cm * 10 = 60 mm.
  • Circle Geometry – Understanding the relationship between radius and diameter, and converting units.
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