A geyser tank has a volume of 0.31246 m3. If the tank is 1315 mm long, what is its diameter? Use pi = 3.142. Round to 3 decimal places.

The volume of the geyser ($V$) is $0.31246 \text{ m}^3$.
The height ($h$) of the geyser (length of the tank from the diagram) is $1315 \text{ mm}$.
We are given $\pi = 3.142$.
The formula for the volume of a cylinder is $V = \pi \times \text{radius}^2 \times \text{height}$.

The diameter of the geyser is $\boxed{\text{0.550 m}}$.

3.1.2

We will use the unrounded diameter from the previous calculation for accuracy: $D \approx 0.55004748 \text{ m}$.
We are given $\pi = 3.142$.
The formula for circumference is Circumference $= \pi \times \text{diameter}$.

The circumference of the geyser is $\boxed{\text{172.77 cm}}$.