The image you've uploaded contains a set of geometry problems involving angle properties. Let's go through each part to determine the unknown angles:

a) Triangle with angles $a$, $b$, and $c$:

• You know that one angle is $30^\circ$.
• In any triangle, the sum of the internal angles is $180^\circ$. Therefore, if one angle is $30^\circ$, and if $a$ and $c$ are the other two angles, we can solve for the unknowns: $a + b + c = 180^\circ$ $30^\circ + b + c = 180^\circ$

b) Adjacent Angles with the angle $70^\circ$ and $43^\circ$:

• Since the angles on a straight line sum to $180^\circ$, we can subtract the known angles from $180^\circ$ to find the unknown angle: $180^\circ - (70^\circ + 43^\circ)$

c) Triangle with $70^\circ$ and $50^\circ$ angles:

• Again, using the fact that the sum of the angles in any triangle is $180^\circ$, we can determine the unknown angle: $70^\circ + 50^\circ + x = 180^\circ$

Would you like me to provide specific answers for these, or do you need additional explanations or steps for the solution?