If to find the area of a triangle is to multiply 1/2 times the measure of the base times the height we need to make that equals to 18 since it’s already given. So 18=1/2 * ((h+1)*6) Now we distribute 18 = 1/2 (6h + 6) 18 = 3h + 3 (Now we subtract 3 from both sides) 15 = 3h (now we divide both sides by 3) 5 = h h = 5
