A **Reuleaux triangle** is a shape formed from the intersection of three circular disks, each having its center on the boundary of the other two.

Let the arc radius be **r**, can you find out what is the area of this Reuleaux triangle?

Fun Fact about PI – we all know that there are many ways to calculate the value of PI; however, do you know we can also get a very good simulation of PI by multiplying these interesting numbers?

1.09999901

×1.19999911

×1.39999931

×1.69999961

= 3.141592573。

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