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28 x 22 = 616
jadi hasilnya ialah 14 pangkat 2
616 cm² = 22/7.r²
616.22/7 = r²
1936 = r²
√1936 = r
44 = r
Jadi, jari-jari lingkaran tsb adalah 44 cm
2. L. Lingkaran = πr²
1017,36 = 3,14 x r²
1017,36 : 3,14 = r²
324 = r²
√324 = r
18 = r
d = 2x18
= 36 cm
Jadi, diameter lingkaran tsb adalah 36 cm