Tolong bantu nomor 1 kak, bang :) pliss :') sumfah gak ngerti
icha294
Sisi alas = phi x r kuadrat = 22/7 x 7 x 7 = 154 sisi selimut = 2 x phi x r x t = 2 x 22/7 x 7 x 20 = 80 luas permukaan tabung = 2 x phi x r ( r + t ) = 2 x 22/7 x 7 (7 + 20) = 1184 maaf kalo salah :)
sisi selimut = 2 x phi x r x t = 2 x 22/7 x 7 x 20 = 80
luas permukaan tabung = 2 x phi x r ( r + t ) = 2 x 22/7 x 7 (7 + 20) = 1184
maaf kalo salah :)
t = 20 cm
= 22/7
a) Luas alas = [/tex] \pi [/tex]r²
= 22/7 x 7 cm x 7 cm
=154 cm²
b) Luas selimut = 2rt
= 2 x 22/7 x 7 cm x 20 cm
= 880 cm²
c) Luas permukaan tabung = 2 r (r + t)
= 2 x 22/7 x 7 cm (7 cm + 20 cm)
= 44 x 27
= 1188 cm²