Question

pake cara 8-15
*Ngasal report*​

Answer 1

Verified answer

Jawaban:

8. A. 65

9. D. 115,65

10. A. 33

11. B. 94,2

12. A.

13. A

14. C

15. A

Penjelasan dengan langkah-langkah:

8. d = 130

r = d/2 = 130/2 = 65

9. Kell tiap bagian

= d + 1/2 . π d

= 45 + (1/2 . 3,14 . 45)

= 45 + 70,65

= 115,65

10. Kell 1/4 lingkaran

= 2r + (1/4 . 2πr)

= 2(12) + (1/4 . 3,14 . 12)

= 24 + 9,42

= 33,42

11. Kell = 2πr

Kell = 2 . 3,14 . 15

= 94,2

12. L = πr²

803,84 = 3,14 . r²

r² = 256

r = 16 cm

kell = 2πr

kell = 2 . 3,14 . 16

= 100,48

13. kell = 2πr

62,8 = 2 . 3,14 . r

r = 62,8 / (2 . 3,14)

r = 10

14. L = πr²

452,16 = 3,14 . r²

r² = 144

r = √144 = 12

d = 2r = 2(12) = 24

15. d1 = 2,8 + 2,8 + 1,4 = 7

r1 = d1/2 = 7/2 = 3,5

d2 = 2,8 --> r2 = 2,8/2 = 1,4

pjg kawat

= πr1 + 2πr2 + 1,4

= (22/7 . 3,5) + (2 . 22/7 . 1,4) + 1,4

= 11 + 8,8 + 1,4

= 21,2 m