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Here is the tutorial.
Step 1
Top plane>>Sketch.
Step 2
Draw a polygon with 25mm side.
Step 3
Extrude it by 20mm.
Step 4
Right plane>>Sketch.
Step 5
Draw this profile.
Step 6
Trim it.
Step 7
Close it.
Step 8
Now revolve it.
Step 9
Section view.
Step 10
Bottom face>>Sketch.
Step 11
Convert the circular edge.
Step 12
Extrude cut it.
Step 13
Polygon face>>Sketch.
Step 14
Draw a circle tangent to the polygon edge.
Step 15
Extrude cut it at 45º draft with flip side to cut checked.
Step 16
We have the part.