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ukuran foto =
tinggi foto = 30
lebar foto = 20
ukuran karton
tinggi karton = tinggi foto + 2 + x = 30 + 2 + x = 32 + x
lebar karton = lebar foto + 2 + 2 = 20 + 2 + 2 = 24 cm
perbandingan =
tinggi foto = tinggi karton ⇒ 30 = 32 + x
lebar foto = lebar karton ⇒ 20 = 24
kalikan silang;
20(32 + x) = (30)(24)
640 + 20x = 720
20x = 720 - 640
20x = 80
x = 4 cm
--No 28--
108° + 12x = 180°
12x = 180° - 108°
12x = 72°
x = 72°/12
= 6°
56 + 5x + 2y = 180°
56 + 5(6) + 2y = 180°
56 + 30 + 2y = 180°
86 + 2y = 180°
2y = 180° - 86°
2y = 94°
y = 94/2
= 47°
12x + 4z + 56 = 180°
12(6) + 4z + 56 = 180°
72 + 4z + 56 = 180°
4z + 128 = 180°
4z = 180° - 128°
4z = 52°
z = 13°
jadi x + y + z = 6 + 47 + 13 = 66°