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188,4=3,14. r. 10
188,4/31,4=r
6=r
.
Luas permukaan kerucut=πr(r+s)
=3,14. 6 (6+10)
=3,14. 6. 16
=3,14. 96
=301,44 cm^2
.
maaf kalau hitunganny salah
188,4. =3.14×r×10
188.4. = 31.4×r
r. = 188.4 :31.4
r. = 6
Luas permukaan = ¶r(r+s)
= 3.14×6(6+10)
= 301.44
nb : ¶ <~~ anggep aja ini phi