$\begin{align}  & \text{If the angle of a quadrilateral are }{{(3y+10)}^{\circ }},\text{ }{{(2y+30)}^{\circ }},{{(y+20)}^{\circ }}\text{ and }4{{y}^{\circ }},\text{ } \\ & \text{Find the  value of }y\text{  } \\ & \text{(A)  1}{{\text{2}}^{\circ }}\text{ (B) 3}{{\text{0}}^{\circ }}\text{ (C) 4}{{\text{2}}^{\circ }}\text{ (D) 6}{{\text{6}}^{\circ }} \\\end{align}$

The value of x in the figure above is

In the diagram above, find the value of x

In the diagram above OR$\parallel $TU, $\angle PQR={{80}^{\circ }}$,and $\angle PSU={{95}^{\circ }}$Calculate $\angle SUT$

What is the size of each interior angle of a 12–sided regular polygon? 

The interior angles of a quadrilateral are ( x +15)^o, (2x –45)^o, (x – 30)^o and ( x +10)^o. Find the value of the least interior angle

In the figure above $TS\parallel XY$and XY = TY, $\angle STZ={{34}^{\circ }},\text{ }\angle TXY={{47}^{\circ }}$find the angle marked n

A regular polygon has 150^o as the size of each interior angle. How many sides does it have?

Find the exterior angle of a 12 sided regular polygon

In the diagram above $PQ\parallel RS$, the size of the angle marked x is