$$3.14 \times { 5 }^{ 2 } \times 15$$
$1177.5$
$$3.14\times 25\times 15$$
$$78.5\times 15$$
$$1177.5$$
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$\frac{3 \cdot 5 \cdot 157}{2} = 1177\frac{1}{2} = 1177.5$
