What is the value of in this diagram?

Camilla is creating a sculpture using five similar triangles.
 

 
What is the size of the angle labelled ?

Pablo creates a design that is made up of 3 rectangles and 2 straight lines, as shown below.
 

What is the size of angle

In the diagram    is a straight line.

What is the size of the angle marked ?

Two squares are drawn on the sides of an equilateral triangle as shown.

A straight line was drawn through the point where the 3 shapes touch.
 

 
What is the size of the shaded angle?