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# Math Circle Presentation

## by John Dalesio, Teacher at International School of Zug & Luzern on Mar 06, 2009

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## Math Circle PresentationPresentation Transcript

• By Jari and Tom
• Why does A=πr 2 work to find the area of a circle.
• A circle was cut into 24 equal pieces.
• 2. The pieces were stuck onto paper in the shape of a rectangle.
• 3. Questions of area were answered.
• 4. Then we had to prove why A=l×w = A=πr 2
• The challenge was to make proof that the formulas work.
• A= l×w
• A =c÷2×r
• A=(π× d) ÷ 2 ×r
• A=(π×2×r)÷2×r
• A=πr 2