tolong Jawab dong teman, pakai cara ya, aku minta tolong sekalii
Penjelasan dengan langkah-langkah:
3. A
AB : BC = 5 : 3
(2x+9) : (4x-3) = 5 : 3
3(2x + 9) = 5(4x - 3)
6x + 27 = 20x - 15
6x - 20x = -27 - 15
-14x = -42
x = -42/-14
x = 3
AB = 2x + 9 = 2(3) + 9 = 15 cm
BC = 4x - 3 = 4(3) - 3 = 9 cm +
AB + BC = 15 + 9 = 24 cm
Keliling = 2(AB + BC)
Keliling = 2(24)
Keliling = 48 cm
4. D
p + l = K/2
3s + 2s = 90/2
5s = 45
s = 45/5
s = 9
Luas = 3s x 2s
Luas = 3(9) x 2(9)
Luas = 6(81)
