Tolong ya..nomor 28,29,30 ya..

Tolong ya..nomor 28,29,30 ya..

28. luas arsiran = 5/6 bagian
luas keseluruhan=
$pi times {r}^{2} \ = frac{22}{7} times 42 times 42 \ = 5 : 544 {cm}^{2}$
luas arsiran =
$frac{5}{6} times 5544 \ = 5 times 924 = 4620 {cm}^{2}$

29. luas arsiran = luas persegi – luas segitiga
luas persegi = 24×24
= 576

luas segitiga.
= 1/2 BE BF
BF = 24 -8
= 16
luas =
$frac{1}{2} times 12 times 16 \ = 6 times 16 \ = 96$
luas arsiran = 576-96 = 480 cm2

30. volume = luas alas x panjang
luas alas =
$3.14 times 10 times 10 \ = 314$
volume = 314 x 34
= 10 676 cm2

Semoga Bermanfaat:):*

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