If five twenty-cent coins are placed in a row touching each other, and then a hollow square made with more coins so that each side consists of five of the same coins, how many coins would you need altogether to form the square?

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- Oct 5th 2012, 05:51 AMSpixol123Maths
If five twenty-cent coins are placed in a row touching each other, and then a hollow square made with more coins so that each side consists of five of the same coins, how many coins would you need altogether to form the square?

- Oct 5th 2012, 06:45 AMemakarovRe: Maths
What do your sketches tell you?

- Oct 5th 2012, 06:50 AMMatthiasChampagneRe: MathsCode:
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