Find the surface area of a square pyramid if the area of the base is 324 cm^2 and the height is 40 cm.

Isee the amount was $90.00 then reduced to $75.00 , what is the percent ?

Determine if the equation defines y as a function of x: 2xy = 1. yes o no

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