L = ½ × jumlah sisi sejajar × t
320 = ½ × (15 + a) × 16
320 = (15 + a) × 8
15 + a = 320/8
15 + a = 40
a = 40 - 15
a = 25 cm
Tentukan panjang sisi belah ketupat
K = 4s
s = K/4
s = 52/4
s = 13 cm
.
Menentukan panjang diagonal lain:
s² = (d1/2)² + (d2/2)²
13² = (24/2)² + (d2/2)²
169 = 144 + (d2/2)²
(d2/2)² = 169 - 144
(d2/2)² = 25
d2/2 = √25
d2/2 = 5
d2 = 5 × 2
d2 = 10 cm
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[Nomor 1]
L = ½ × jumlah sisi sejajar × t
320 = ½ × (15 + a) × 16
320 = (15 + a) × 8
15 + a = 320/8
15 + a = 40
a = 40 - 15
a = 25 cm
[Nomor 2]
Tentukan panjang sisi belah ketupat
K = 4s
s = K/4
s = 52/4
s = 13 cm
.
Menentukan panjang diagonal lain:
s² = (d1/2)² + (d2/2)²
13² = (24/2)² + (d2/2)²
169 = 144 + (d2/2)²
(d2/2)² = 169 - 144
(d2/2)² = 25
d2/2 = √25
d2/2 = 5
d2 = 5 × 2
d2 = 10 cm