suatu lingkaran mempunyai jari-jari 31,5 cm. luas lingkaran tersebut adalah... cm²
a. 2.118,5
b. 2.818,5
c. 3.118,5
d. 3.881,5
jawab pake cara yaa
a. 2.118,5
b. 2.818,5
c. 3.118,5
d. 3.881,5
jawab pake cara yaa
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Luas lingkaran
[tex]\pi \times r \times r \\ \\ \frac{22}{7} \times 31,5 \: cm \times 31,5 \: cm \\ \\ 3118,5 \: {cm}^{2} \: (c)[/tex]
LP :
= πR²
= 22/7(31,5(31,5)
= 22/7(992,25)
= 22(992,25)/7
= 21.829,5/7
= 3.118,5 CM²