S = 1/2*a*b sin 45 = b/c ⇒ 1/√2 =b/8 b=8/√2 cos 45 = a/c ⇒1/√2 = a/8 a = 8/√2 S = 1/2 * 8/√2* 8/√2 = (1*8*8)/2*√2*√2 = 64/4 = 16 кв. ед.