S= ab
a=3 3/4
b= 15 : (3 3/4) = 15: (15/4) = 4 см
Р = 2 (a+b) = 2 (4+ 3 3/4)= 2 (16/4 + 15/4) = 2* 31/4 = 31/2 = 15 1/2 см
S= ab
a=3 3/4
b= 15 : (3 3/4) = 15: (15/4) = 4 см
Р = 2 (a+b) = 2 (4+ 3 3/4)= 2 (16/4 + 15/4) = 2* 31/4 = 31/2 = 15 1/2 см