To find the area of a right triangle, you can use the formula:
\[ \text{Area} = \frac{1}{2} \times \text{base} \times \text{height} \]
In this case, if we assume that the lengths of the two legs of the triangle are 6 and 21 units, then you can calculate the area as follows:
\[ \text{Area} = \frac{1}{2} \times 6 \times 21 = \frac{1}{2} \times 126 = 63 \text{ units squared} \]
So, the area of the right triangle is 63 units squared.