Tolong jawab ya
pake cara ya
dik = d = 40 cm = r = 20 cm
t = 40 cm
14. volume tabung = πr²t = 3,14 x 20 x 20 x 40
= 314 x 80
= 50240 cm³
15. luas selimut tabung = 2πrt
= 2 x 3,14 x 20 x 40
= 628 x 8
= 5024
16. luas permukaan = 2πr(r+t)
= 2 x 3,14 x 20 ( 20+40)
= 614 x 12
= 7536
17. sudut B = sudut F = 100 derajat
sudut A = sudut E = 50 derajat
sudut G = sudut C = ……. derajat
= 360 – (( 2 x 100)+(2 x 50))
= 360 – (200+100)
= 360 -300
= 60
= sudut G + sudut C = 60
= 60 ÷ 2
= 30 derajat