A plane cuts a pyramid as shown in the diagram. What is the shape of the cross section
A. Hexagon
B. Pentagon
C. Square
D. Triangle

Change negative exponents to positive, then solve

The perimeter of ? cde is 55 cm. a rhombus dmfn is inscribed in this triangle so that vertices m, f, and n lie on the sides cd , ce , and de respectively. find cd and de if cf=8 cm and ef=12 cm. the answer is not cd=20 and de=15. i have tried that one, it does not work.

Which of the following is true about the following construction of a tangent to a circle from a point outside of the circle?