Tolong no 25 dg jawabanya

Luas juring = (288/360) x π x 15 x 15
                   = 180π

Luas juring = luas selimut kerucut
Lj = πrs
180π = π x r x 15
180 = 15r
r = 12 cm

t² = 15² - 12²
   = 225 - 144
t² = 81
t = 9 cm

V kerucut = 1/3 πr²t
                = 1/3 x π x 12 x 12 x 9
                = 432π cm³

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