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# Math Circle Presentation

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### Math Circle Presentation

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