Materi : Bangun Ruang Sisi Lengkung

Soal Nomor 1

Luas Permukaan Tabung

Lp = 2( π × r² ) + π × d × t

Lp = 2( 22/7 × 14² ) + 22/7 × 28 × 15

Lp = 2( 22 × 2 × 14 ) + 22 × 4 × 15

Lp = 2( 44 × 14 ) + 22 × 60

Lp = 2( 616 cm² ) + 1.320 cm²

Lp = 1.232 cm² + 1.320 cm²

{ Lp = 2.552 cm² }

Soal Nomor 2

Luas Permukaan Limas

Lp = luas alas + 4 × luas sisi tegak

Lp = sisi² + 4 × ½ × a × s

Lp = 20² + 2 × 20 cm × 25 cm

Lp = 400 cm² + 2 × 500 cm²

Lp = 400 cm² + 1.000 cm²

{ Lp = 1.400 cm² }

Soal Nomor 3

Luas Permukaan Bola

Lp = 4 × π × r²

Lp = 4 × 3,14 × 15 cm × 15 cm

Lp = 3,14 × 60 cm × 15 cm

Lp = 3,14 × 900 cm²

{ Lp = 2.826 cm² }

Semoga bisa membantu