Volume kerucut =1.256 cm3 .jika tinggi=12 cm dan phi=3.14. Hitung jari-jari alas kerucut

diket :
v = 1.256cm³
t = 12cm
π = 3,14
dit = r

v = 1/3×πr²×t
1.256 = 1/3×3,14×r²×12
1.256 ÷ 1/3 = 3,14×r²×12
1.256 × 3 = 3,14×r²×12
3.768 = 37,68×r²
3.762 ÷ 37,68 = r²
100 = r²
[tex] \sqrt{100} [/tex] = r
10 cm = r