(2014) Chinese provincial series Atlas: Atlas Inner Mongolia(Chinese Edition)

(2014) Chinese provincial series Atlas: Atlas Inner Mongolia(Chinese Edition)

Matematika tolong cepetan ya ka besok mau di kumpulin​

tolong cepetan ya ka besok mau di kumpulin​

JAWABAN | MATEMATIKA

1. Diketahui = d = 20 cm maka r = d : 2

= 20 : 2

= 10 cm

Rumus = Lp = 4 x π x r x r

= 4 x 3,14 x 10 x 10

= 4 x 31,4 x 10

= 4 x 314

= 1.256 cm²

Jadi luas permukaan bangun ruang di atas adalah 1.256 cm²

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2. Diketahui = t kerucut = 18 cm, t total = 54 cm maka t tabung = 54 - 18 cm = 36 cm, d = 28 cm maka r = d : 2 = 28 : 2 = 14 cm

Rumus V ( kerucut ) = 1/3 x π x r x r x t

= 1/3 x 22/7 x 14 x 14 x 18

= 1/3 x 22 x 2 x 14 x 18

= 1/3 x 44 x 14 x 18

= 1/3 x 616 x 18

= 1/3 x 3.696

= 1.232 cm³

Rumus V ( tabung ) = π x r x r x t

= 22/7 x 14 x 14 x 36

= 22 x 2 x 14 x 36

= 44 x 14 x 36

= 616 x 36

= 22.176 cm³

Rumus V ( total ) = 1.232 cm³ + 22.176

= 23.408 cm³

Jadi volume bangun gabungan gambar di atas adalah 23.408 cm³

SEMOGA MEMBANTU | MOHON MAAF JIKA SALAH

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