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In the image below the formation at a is the Crater Face. As can be seen it is approximately on a straight line or degenerate triangle caf where c is the KK face and f is the Hangar. The angle fah is also about 35 degrees like on the previous page. The angle cae and eaf are each around 90 degrees. The triangles cae and fae are approximately equal to each other in size and dimensions, so the Crater Face is approximately half way between the KK face  and Hangar. That makes cfe an Isosceles triangle with angles of 40, 40 and 100 degrees.