A slice is made perpendicular to the base of a right rectangular pyramid through the vertex.
What is the area of the resulting two-dimensional cross section?
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What is the length of bc ? enter your answer in the box.bc =

A20? -foot ladder is placed against a vertical wall of a? building, with the bottom of the ladder standing on level ground 19 feet from the base of the building. how high up the wall does the ladder? reach?

Given: klmn is a parallelogram m? n=3m? k, lf ? kn , ld ? nm kf=2 cm, fn=4 cm find: lf, ld