17. Square base pyramid No faces perpendicular Some edges perpendicular No faces parallel Some edges parallel
18.
19. Written task Cube Cuboid Cone Square based- Pyramid Sphere Hemispere SOME PERPENDICULAR FACES NO PERPENDICULAR FACES SOME PARALLEL FACES NO PARALLEL FACES
20. Written task Cube Cuboid Square-based pyramid Sphere Hemisphere Cone SOME PERPENDICULAR EDGES NO PERPENDICULAR EDGES SOME PARALLEL EDGES NO PARALLEL EDGES