Penjelasan dengan langkah-langkah:
1. diagonal df = 15√2 cm
panjang sisi
df = s√2
15√2 = s√2
s = 15 cm
luas defg
= s x s
= 15 x 15
= 225 cm²
2. ae = 5 cm
ad = 13 cm
dc = 14 cm
bc = 20 cm
panjang de
= √ad² - ae²
= √(13² - 5²)
= √(169 - 25)
= √144
= 12 cm
panjang bf (buat imajiner cf sejajar de)
= √bc² - de²
= √(20² - 12²)
= √(400 - 144)
= √256
= 16 cm
panjang ab
= ae + ef + bf
= 5 + 14 + 16
= 35 cm
luas
= jumlah sisi sejajar . t : 2
= (dc + ab) . de : 2
= (35 + 14) . 12 : 2
= 49 x 6
= = 294 cm²
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Penjelasan dengan langkah-langkah:
1. diagonal df = 15√2 cm
panjang sisi
df = s√2
15√2 = s√2
s = 15 cm
luas defg
= s x s
= 15 x 15
= 225 cm²
2. ae = 5 cm
ad = 13 cm
dc = 14 cm
bc = 20 cm
panjang de
= √ad² - ae²
= √(13² - 5²)
= √(169 - 25)
= √144
= 12 cm
panjang bf (buat imajiner cf sejajar de)
= √bc² - de²
= √(20² - 12²)
= √(400 - 144)
= √256
= 16 cm
panjang ab
= ae + ef + bf
= 5 + 14 + 16
= 35 cm
luas
= jumlah sisi sejajar . t : 2
= (dc + ab) . de : 2
= (35 + 14) . 12 : 2
= 49 x 6
= = 294 cm²