WHAT IS THE GREEN AREA?

[@lasalleman6792]

Iso. triangle. Two sides equal, base comes out to 18. Drop a line from the top apex of the total triangle down to the base. Basically set up two triangles out of the green area. The one on the right will have a base of 5. (One-half of total base [18 is 9] then less 4 in the white area. ) New base is 5. Then 13 becomes hypotenuse, 5 becomes cosine. Going Pythagorean plus a little trig, gives a sine of 12, which is the height of the total triangle, greeen plus white. Total area of green triangle is thus green base 14, times height of 12, divided by two, gives area of green triangle of 84 Short and sweet. Even I did it without too much trouble .