Jawaban:
1.) keliling:
K = s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8
K = 9 + 9 + 3 + 3 + 3 + 3 + 3 + 3
K = 18 + 6 + 6 + 6
K = 24 + 12
K = 36cm
2.) Sisi
s = ½√d1² + d2²
s = ½√12² + 16²
s = ½√144 + 256
s = ½√400
s = ½ × 20
s = 10cm
Keliling belah ketupat:
K = 4s
K = 4(10)
K = 40cm
3.)diagonal lainnya:
L = ½ × d1 × d2
135 = ½ × 18 × d2
135 = 9 × d2
135 ÷ 9 = d2
15cm = diagonal lainnya
4.) Luas jajar genjang:
L = alas × tinggi
L = 10 × 12
L = 120cm²
5.) Panjang sisi AC:
AB = BC
K = AB + BC + AC
135 = 47 + 47 + AC
135 = 94 + AC
135 - 94 = AC
41cm = AC
6.) Luas segitiga:
L = ½ × alas × tinggi
L = ½ × 21 × 12
L = ½ × 252
L = 126cm²
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Jawaban:
1.) keliling:
K = s1 + s2 + s3 + s4 + s5 + s6 + s7 + s8
K = 9 + 9 + 3 + 3 + 3 + 3 + 3 + 3
K = 18 + 6 + 6 + 6
K = 24 + 12
K = 36cm
2.) Sisi
s = ½√d1² + d2²
s = ½√12² + 16²
s = ½√144 + 256
s = ½√400
s = ½ × 20
s = 10cm
Keliling belah ketupat:
K = 4s
K = 4(10)
K = 40cm
3.)diagonal lainnya:
L = ½ × d1 × d2
135 = ½ × 18 × d2
135 = 9 × d2
135 ÷ 9 = d2
15cm = diagonal lainnya
4.) Luas jajar genjang:
L = alas × tinggi
L = 10 × 12
L = 120cm²
5.) Panjang sisi AC:
AB = BC
K = AB + BC + AC
135 = 47 + 47 + AC
135 = 94 + AC
135 - 94 = AC
41cm = AC
6.) Luas segitiga:
L = ½ × alas × tinggi
L = ½ × 21 × 12
L = ½ × 252
L = 126cm²