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Verified answer
Cari tinggi kerucutt² = s² - r²
t² = 10² - 5²
t² = 100 - 25
t² = 75
t = √75
tinggi kerucut = 1/2 tinggi tabung
tinggi tabung = 2 tinggi kerucut
T = 2 . t
T = 2 . √75
jawaban D