A cone is inside a cylinder. The cone and the cylinder have the same base and height.

The part of the cylinder that is NOT taken up by the cone has twice the volume of the cone. What fraction of the total cylinder is taken up by the cone?

The figure shows triangle def and line segment bc, which is parallel to ef: triangle def has a point b on side de and point c on side df. the line bc is parallel to the line ef. part a: is triangle def similar to triangle dbc? explain using what you know about triangle similarity. part b: which line segment on triangle dbc corresponds to line segment ef? explain your answer. part c: which angle on triangle dbc corresponds to angle f? explain your answer. asap