# A right triangle has sides A, B, and C. Side A is the hypotenuse and side B is also a side of a rectangle. Sides A, C, and the side of the rectangle adjacent to side B have lengths of 5 , 2 , and 11 , respectively. What is the rectangle's area?

Area of the rectangle, ${A}_{\square} = H \cdot B = 11 \cdot \sqrt{21}$
$B = \sqrt{{A}^{2} - {C}^{2}} = \sqrt{{5}^{2} - {2}^{2}} = \sqrt{21}$
Area of the rectangle, ${A}_{\square} = H \cdot B = 11 \cdot \sqrt{21}$