December 2018 2 9 Report
Diketahui segitiga PQR dgn sisi-sisi 15cm,18cm, dan 21cm . Panjang jari-jari lingkaran luar segitiga tersebut adalah...cm
A. 10,71. C. 13,04
B. 12,87. D. 15,12
Berikan caranya,trima kasih
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