Question

1. dik = luas alas kerucut = 346,5 cm2
volume kerucut = 1386 cm3
dit = jari jari=....?
tinggi =....?

Answer 1

Volume kerucut= 1/3×L alas×t
1386= 1/3×346,5×t
4158=346,5×t
t=4158/346,5
t=12cm

L alas= L lingkaran
346,5= 3,14×r×r
346,5/3,14=r2
r= 10,5cm

Answer 2

• La=Llingkaran= phi× r×r
346,5 = 22/7×r×r
r = √110,25
=10,5 cm
•V = 1/3×phi×r×r×t
1386 =1/3× 22/7×10,5×10,5×t
t =12 cm