**(a).**

The given function is A(r) = πr^{2}.

Put r = 2.34, we have,

A(2.34) = π(2.34 × 2.34)

A(2.34) = 3.14159 × 2.34 × 2.34

A(2.34) = 17.212 in^{2}

**(b).**

The given function is A(r) = πr^{2}.

Put r = 6.41 m, we have,

A(6.41) = 3.14159 × 6.41 × 6.41

A(6.41) = 129.08 m^{2}

**(c).**

The given function is A(r) = πr^{2}.

Put r = 5/11 in, we have,

A(5/11) = 22/7 × 5/11 × 5/11

A(5/11) = 50/77 = 0.6491 in^{2}

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