Question

Sebuah kerucut v=154 cm3 dan t=12 cm. tentukan panjang r alas kerucut tsb, jika phi = 22/7

Answer 1

154 = 1/3 x 22/7 x r x r x 12
154 = 22/7 x rx r x 4
616 = 22/7 x r x r
7/22 x 616 = r x r
196 = r x r
r = 14

Answer 2

V    = 1/3πr²t
154 = 1/3.22/7.r².12
(154.7)/88 = r²
  √12,25   =  r
      3,5    =  r