Lesson eLearning

A circle has a radius of 5 cm. Find its circumference using the value of π = 3.14.

hard 2 marks Class 3 · Mathematics · Shapes and Designs
Answer
31.4 cm

The correct answer is 31.4 cm — Step 5: Write the final answer as 31.4 cm.

Step-by-step solution

  1. Step 1: Recall that circumference of a circle = 2 × π × radius.
  2. Step 2: Substitute the given values: 2 × 3.14 × 5 cm.
  3. Step 3: Multiply 3.14 by 5: 3.14 × 5 = 15.7.
  4. Step 4: Multiply the result by 2: 2 × 15.7 = 31.4 cm.
  5. Step 5: Write the final answer as 31.4 cm.
Common mistake: Using π = 3 instead of 3.14 or forgetting the factor 2.

Concept tested: Circumference of a circle

Published · How this solution was prepared and checked

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