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Verified answer
Verified answer
No.2Kll = 2 (P + L) , jika p = 2 + L , maka
28 = 2 (2 + L + L)
28 = 2 (2 + 2L)
28 = 4 + 4L
4L = 28 - 4
L = 24/4
L = 6 Cm <<== Lebar
karena P = 2 + L maka P = 8 cm
Sehingga
Luas = P x L
Luas = 8 x 6
Luas = 48 cm^2 <<==== Luas
No.3
Kll = 150 cm , jika P = 15 + L , maka
Kll = 2 (P + L)
150 = 2 (15 + L + L)
150 = 30 + 4L
4L = 150 - 30
L = 120/4
L = 30 cm <<=== Lebar
karena P = 15 + L , maka P = 45 cm
sehingga
Luas = P x L
Luas = 45 x 30
Luas = 1350 cm^2 <<=== Luas
No.4
Kll = 32 + 9 + 9 + 11 + 15 + 11 + 9 + 24 + 12 + 20
Kll = 152 cm
No.5
Sisi = x + 2
tinggi = 3x - 14
L.ABCD = L.ABE
S x S = 1/2 sisi x Tinggi
(x + 2) (x + 2) = 1/2 (x + 2) (3x - 14)
x^2 + 4x + 4 = 1/2 (3x^2 - 8x - 24)
2x^2 + 8x + 8 = 3x^2 - 8x - 24
3x^2 - 2x^2 - 8x - 8x - 24 - 8 = 0
x^2 - 16x - 32 = 0
gunakan rumus kecap a b c untuk mencari nilai x...
sehingga di dapat
x = 18