Question

diameter equal 49 CM

Answer 1

2r = 49
r = 49/2
area = pi×r²
       =  22/7×49/2×49/2
        = 1886.5cm²

Answer 2

$diameter \: = \: 2 \times radius \\ d \div 2 = r \\ 49 \div 2 = r \\ area \: of \: circle = \pi \times {r}^{2} \\ 22 \div 7 \times 49 \div 2 \times 49 \div 2 \\ = 1886.5 {cm}^{2}$

perimeter = 2*22/7*49/2
...................= 154cm