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b. phi . r ( r + s) = 22/7 . 7 ( 7+25) = 704 cm
jadiin yang terbaik ya:)
1. tinggi kerucut : 25 kuadrat - 7 kuadrat
= 625 - 49
= 576
= akar dari 576 = 24 cm
2. Luas permukaan kerucut : pi. r (r+s)
=22/7. 7 ( 7+25)
= 22. 32
= 704 cm