Find the number of sides a regular polygon whose interior angle is twice the exterior angle

The sum of the interior angles of a polygon is 20 right angles. How many sides does the polygon have?

In the diagram above PQ is parallel to RS. What is the $\alpha +\beta +\gamma $

The sum of interior angles of a regular polygon is 1800^o. Calculate the size of one exterior angle of the polygon

In the diagram above, calculate the value of x

In the diagram above, find the value of x

In the parallelogram PQRS above, find angle SQR

Find the exterior angle of a 12 sided regular polygon

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

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

In the diagram above, find the value of x

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

In the figure above, $KL\parallel NM$, LN bisect $\angle KNM$. If angle KLN is 54^o and angle MKN is 35^o. Calculate the size of angle

How many sides has regular polygon having one of its interior angles as 150^o

The sum of the interior angles of a polygon is given as 1080^o. Find the number of the sides of the polygon.

Find the number of sides of a regular polygon if the size of each interior is 150^o