Answer:
on a triangle the bottom is always smaller then the two sides , also the two sides should be equal unless it an isosceles triangle. <3 I hope this helps .
25 - 6 = 19 so 19 ft. it was 19 ft before he cleaned out the tank.
125+85+22.5+22.5+65=320
320x0.06=9.2
12x10=120
320+19.2+120=459.2
