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=
=
= √25
= 5
L.slimut krucut = 8 x x 8 x 5
= 160 cm²
L.slimut kubus = 4 s²
= 4 .8²
= 4 . 64
= 256
L.permukaan benda = L.slimut krucut + L.slimut kubus
= 160 + 256
= 416 cm²
V.bangun = 2 .V krucut + V kubus
= 2 x x 8² x 3 + 8³
= 2 x 64 + 512
= 128 + 512
= 640 cm³
2) misal daerah putih = x
x = L.persegi - L.juring
= 8² - x 3,14 x 8²
= 64 - 50,24
= 13,76
L.diarsir = L.persegi - 2. x
= 8² - 2 . 13,76
= 64 - 27,52
=36,48 cm²
keliling diarsir = 2 x panjang busur
= 2 x x 2 x 3,14 x 8
= 25,12 cm
soal no.3 tidak tampak ....