If the vertex angle (Î¸) and leg lengths (a) of an isosceles triangle are known, then the area of that triangle is: This is derived by drawing a perpendicular line from the base of the triangle, which bisects the vertex angle and creates two right triangles. The bases of these two right triangles are both equal to the hypotenuse times the sine of the bisected angle by definition of the term sine.
1 The Andrews-Murphy Airport is listed at 1,699 feet. 2  The countyâs highest elevation is at 5,149 feet. (Where Cherokee and Clay counties meet near Tusquitee Bald at Fires Creek.)  The countyâs lowest elevation is listed as 1,170 feet. (Where Apalachia Lake crosses into Tennessee.)
The Dan River-Stokes County, North Carolina. Stokes County was created from Surry County in 1789. It was named in honor of Captain John Stokes, a soldier in the American Revolution, who was seriously wounded at the Waxhaw Massacre when Colonel Buford's Regiment was cut to pieces by Tarlton.