what is the value of B for the following triangular? Remember there are 10 mm in a centimeter 3 cm^230 cm^215 cm^21.5 cm^2

B = area of the base
Since the base is a rectangle
Area of a rectangle = Lenght x width
Lenght = 4 cm
Width = 12 mm = 12 / 10 =1.2
B = 4 x 1.2 = 4.8 cm2