Question

No 15-20 dong besok dikumpulin....

Answer 1

15. 3 pasang

16. d = 30 t = 30
lp = πdt + 2πr²
=( 3,14 x 30 x 30 ) + (2 x 3,14 x 15²)
= 2826 + 1413
= 4239

17. lp = 4 π r²
= 4 x 22/7 x 21 x 21
= 5544

18. r = 14 , t = 21
lp = seng terbuka + ( 2 x 22/7 x 14 x14) = 1232

19. v tabung = πr²t
3465 = 22/7 x r² x 10
3465 x 7/22 /10 = r²
110,25 = r²
10,5 = r

d = 21

20. lp = 4 π r²
= 4 x 22/7 x 7 x 7
= 616