jawaban serta caranya
A. 7.192 cm²
B. 7.292 cm²
C. 7.392 cm²
D. 7.492 cm²
A. 7.192 cm²
B. 7.292 cm²
C. 7.392 cm²
D. 7.492 cm²
-Luas permukaan tabung-
--) alas dan atas
2 × π × r²
--) selimut
2 × π × r × t
Jawaban
2 × 22/7 × 21 × 21
2 × 22 × 3 × 21
44 × 63
= 2.772
2 × 22/7 × 21 × 35
2 × 22 × 3 × 35
44 × 105
= 4.620
--) 4.620 + 2.772 = 7.392 cm² (C)
[tex]\huge\tt{~TaBuNg}[/tex]
R : 21 cm
T : 35 cm
LP : .....?
- LP : 2πr( r + t)
- LP : 2 × 22/7 × 21(21 + 35)
- LP : 2 × 22 × 3(56)
- LP : 44 × 168
- LP : 7.392 cm² » c
