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"Jika suatu lingkaran memiliki jari-jari sebesar $latex r=7 cm$, maka berapakah luas lingkaran tersebut?", tanya guru SD kita saat itu. Spontan saja langsung kita jawab $latex 154 cm^{2}$, yang didapat dari penghitungan rumus luas lingkaran $latex L=\pi r^{2}$. ...