Ca'Marion designs a sign for a store in the shape of a triangle. His design has a base of 14 feet and a height of 3 feet. What is the area of his designs?

The area of a triangle is calculated using the formula:

Area = 1/2 * base * height

Plugging in the values given:
Area = 1/2 * 14 feet * 3 feet
Area = 1/2 * 42 feet
Area = 21 square feet

Therefore, the area of Ca'Marion's design is 21 square feet.