Percentage of Other Dry Elements in the human body = $100 – (\text{Percentage of Proteins + Percentage of Water}) = 100 - (16 + 70) = 100 – 86 = 14\%$

The following pie-chart represents the scenario described in the question.

Pie Chart

So, percentage of both Proteins and Other Dry Elements, i.e. $p = 16 + 14 = 30\%$ In a pie diagram, 100% corresponds to $360°$.

So, 30% will correspond to $(\frac{360}{100}) \times 30 = 108°$

That is, the central angle of the sector representing $p$ on the pie diagram = $108°$