The expression 1 2 b h 2 1 ​ bhstart fraction, 1, divided by, 2, end fraction, b, h gives the area of a triangle where b bb is the base of the triangle and h hh is the height of the triangle. What is the area of a triangle with a base of 7 cm 7 cm7, start text, space, c, m, end text and a height of 4 cm 4 cm4, start text, space, c, m, end text?