anggar1997
nomer 3... volume kerucut = 1/3 x luas alas x tinggi ----->> 720 = 1/3 x 22/7 x r x r x 15 ---->> 48 = 22/21 x r x r --->> 45,81818181 = r x r --->> r = akar dari 45,818181818181 --->> r = 6,76 cm
anggar1997
nomer 4...... volume kerucut = 1/3 x luas alas x tinggi --->>> 115,5 = 1/3 x 22/7 x 3,5 x 3,5 x t --->>> 9,428 = 22/21 x t --->>> tinggi = 9 cm
a.>>>
r = 21 cm
t = 10 cm
volume = 1/3 x 22/7 x 21 x 21 x 10 = 4620 cm³
b.>>>
d = 12 cm --->> r = 6 cm
t = 7 cm
volume = 1/3 x 22/7 x 6 x 6 x 7 = 264 cm³