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Physics optic question

A ray enters an equilateral glass prism of refractive index 1.55 at the midpoint of one side of the prism at an angle of inceidence of 35 degrees.
a. Sketch this arrangement and show that the angle of refraction of the light ray in the glass is 22 degrees.
b. Show that the angle of incidence where the light ray leaves the glass prism is 38 degree.
c. Calculate the angle of refraction of the light ray where it leaves the prism.

I know these question is already answered but i can't get how you can draw the triangule or rectangle.

Im very confused with question, i appreciate the help.

Thanks
Draw a triangle (60 - 60 - 60)
At the mid-point of one side, draw a normal to the line.
Draw a ray with an angle of 35 deg to that normal.
Use Snell's law to calculate the angle of refraction.
Draw the refracted ray on the diagram, and use geometry to find the angle this ray hits the other side ..... etc
Show your working if you're not getting the expected answers.

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