Math Problem Solver

\[3.14 \cdot 7 \cdot 7 = \frac{7693}{50} = 153.86\]

\[\begin{aligned}3.14 \cdot 7 \cdot 7& = \left(3 + \frac{14}{100}\right) \cdot 7 \cdot 7\\& = \left(3 + \frac{7}{50}\right) \cdot 7 \cdot 7\\& = \frac{157}{50} \cdot 7 \cdot 7\\& = \frac{1099}{50} \cdot 7\\& = \frac{7693}{50}\end{aligned}\]