Why do pyramids have a slanting face?

What is the part of a circle bounded by an arc and a chord? What must be added to 12345 to make the next perfect square? How much of an acre is 13500 sq ft? How many right angles on all the faces of a Octagonal Prism? What is the surface area of a rectangle prism? What is the diameter of of a circle when the area is 201.1? What is the slope of (52) and (13)? Why it is called undefined terms in geometry? If line KL is a bisector of at point J which of the following statements is true? The diagonals of a parallelogram are 7 inches and 9 inches respectively they intersect at an angle of 52 degrees Find the sides of the parallelogram? What is the perimeter of a rectangle with length 14 centimeters and width of 9 centimeters? What are the two sides of a coin usually called? Where do you put captains bars on the collar? Should I buy a house with a cross gabled or cross hipped roof? What is the difference between rechtangular and circular waveguide? What are the name of the three triangles? How does laminate wood flooring compare to tile flooring? What is 13ft x 8ft into square meter? What is 457 sided polygon? How is scale factor similar to unit rate?