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Maka Diameter=154 Dibagi 22/7=49
Maka Jari-Jari Lingkaran=49/2=24,5
Luas= × r²=3,14×24,5²=3,14×600,25=1884,785 cm²
154 = 22/7 . d
d = 154 : 22/7
d = 154 x 7/22
d = 49
Maka,
L.Lingkaran = 1/4πd²
= 1/4 . 22/7 . 49²
= 22/28 . 2401
= 1886,5 cm²
Itua jawabannya.