To find the area of a triangle, you can use the formula:
Area = 1/2 * base * height
Given that the base of the triangle is 7 cm and the height is 6 cm, you can substitute these values into the formula:
Area = 1/2 * 7 cm * 6 cm
Area = 1/2 * 42 cm^2
Area = 21 sq cm
Therefore, the correct answer is:
A. 21 sq cm