Treasure Inspiration
Circles
T

Working with Circumference and Area

Push a bit harder. Apply what you know to less familiar problems.

Mathematics · Medium

5

questions · ~4 min · 3 hints each (−5 pts)

Confidence tracking, 3-tier hints and instant feedback.

What you'll learn

Each question helps you build key knowledge and skills.

  • 1Rearrange C = 2πr or A = πr² to find the radius or diameter when given circumference or area.
  • 2Semicircle perimeter = half the circumference + the diameter (the straight edge).
  • 3Compound shapes with circles need each part's area calculated separately then combined.
  • 4Always use π = 3.14 unless told to give an exact answer in terms of π.

Question mix

A mix of question types to build your skills.

  • Fill the gap×5

Different question types help you think in different ways.

How it works

A simple 3-step process

  1. 1

    Rate your confidence

    Tell us how sure you feel before answering. It helps us understand your starting point.

  2. 2

    Use hints if stuck

    Get up to 3 helpful hints per question. Each hint costs 5 Treasure Points.

  3. 3

    See what went wrong

    Get instant feedback with clear explanations, so you can learn and improve.

Ready when you are

This takes about 4 minutes.