The area \( A \) of a triangle can be found using the formula:
\[ A = \frac{1}{2} \times \text{base} \times \text{height} \]
For Triangle C, you provided the base as 10 feet and the height also as 10 feet. Plugging these values into the formula gives:
\[ A = \frac{1}{2} \times 10 \text{ feet} \times 10 \text{ feet} \]
Calculating this:
\[ A = \frac{1}{2} \times 100 \text{ square feet} = 50 \text{ square feet} \]
So, the area of triangle C is 50 square feet.