bantu gaess, asal report
r = 5 cm
t = 12 cm
s = √12² + 5²
= √144 + 25
= √169
= 13 cm
Lp = 2πr² + πrs
= 2.(3,14).(5)² + 3,14.(5).(13)
= 2.(3,14).(25) + 3,14.(65)
= 157 + 204,1
= 361,1 cm² [D]
Menentukan selimut (s) kerucut.
s² = t² + r²
s² = 12² + 5²
s² = 144 + 25
s² = 169
s = √169
s = 13 cm
.
Lp total
= Lp ½ bola + Lp kerucut tanpa alas
= 2πr² + πrs
= πr(2r + s)
= 3,14 × 5 × (2(5) + 13)
= 15,7 × (10 + 13)
= 15,7 × 23
= 361,1 cm²
opsi D
[answer.2.content]
