Question

40b простая геометрия

Answer 1

P = 2a+2b

2a+2b = 30

2(b+8)+2b = 30

4b+16 = 30

4b = 14

b = 3.5

a = 3.5+8 = 11.5

S = a*b = 11.5*3.5 = 40.25

Ответ: 40.25