??????????????????? "vertikal angel" ??????????????
me assume yu meen angel at the top=80 deg
and the base =horizontal line at botton (kros from the top angel)
eech base angel=(180-80)/2=50 deg
draw vertikal line from top tu base & yu get rite triangel & hite is 1 side av it
Its base=15/2=7.5
tan(40 deg)=(7.5/hite), so hite=7.5/tan(40 deg)
hite=7.5 / 0.839099631=7.5*1.191753593=8.938151944
triangel area=(1/2)hite*base=hite*(base/2)=8.938151944*7.5
area=67.03613958