02-S2-Q7 Read more about 02-S2-Q7 3-dimensional, vector geometry, lines, distance, perpendicular. [STEP II 2002 Question 7 (Pure)]
93-S1-Q8 Read more about 93-S1-Q8 Intersection of surface with spheres, Little Fitton. [STEP I 1993 Question 8 (Pure)]
89-S3-Q1 Read more about 89-S3-Q1 Area of surface, sphere, conic section, tangent, circle. [STEP III 1989 Question 1 (Pure)]
