HW 8

Does anyone have any hints for numbers 4,6, or 7?

For 6 use the fact about areas using sines, the angles of squares are 90degrees and thm 19, and sides of a square are all the same length. And all the areas will in some way relate to area (ABC).

For 7 use thm 21. the given and thm 1b. and relate thm 19.--Jrhaynie 14:20, 28 October 2009 (UTC)