Adding dipoles

You will write two functions that add bond dipoles, then use the idea of full charges to find how ionic a bond is.

The idea. Two equal bond dipoles at an angle $\theta$ add to $2\mu_b\cos\dfrac{\theta}{2}$. In a flat molecule, each bond dipole has a size and a direction; add the $x$ parts and the $y$ parts, then take the length of the result. A charge $e$ at $100\ \text{pm}$ gives $4.803\ \text{D}$.

Your tasks.

1. Complete two_bonds(m, angle) for two equal bond dipoles $m$ at angle degrees.
2. Complete flat_sum(bonds), where bonds is a list of (size, direction in degrees).
3. Caesium fluoride gas has a dipole of $7.88\ \text{D}$ and a bond length of $235\ \text{pm}$. Set ionic_pct, rounded to 1 place.