hitunglah panjang jari

A.
[tex]l \: = \: \pi \times r \times r \\ \: \: \: \: = \frac{22}{7} \times 63 \times 63 \\ \: \: \: \: = 12474 \: {cm}^{2} [/tex]
B.
[tex]l \: = \pi \times r \times r \\ \: \: \: \: = 3.14 \times 30 \times 30 \\ \: \: \: \: = 2826 \: {cm}^{2} [/tex]
C.
[tex]l \: = \pi \times r \times r \\ \: \: \: \: = 3.14 \times 40 \times 40 \\ \: \: \: \: = 5024 \: {cm}^{2} [/tex]
D.
[tex]l \: = \pi \times r \times r \\ \: \: \: \: = 3.14 \times 25 \times 25 \\ \: \: \: \: = 1962.5 \: {cm}^{2} [/tex]
E.
[tex]l \: = \pi \times r \times r \\ \: \: \: \: = \frac{22}{7} \times 24.5 \times 24.5 \\ \: \: \: \: = 1886.5 \: {cm}^{2} [/tex]