A cone has a circular base with a diameter of 18 inches. The height of the cone is 40 inches What is the approximate lateral area of the cone? Use 3.14 for pie and round to the nearest whole number

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