Penjelasan dengan langkah-langkah:
4) a
Persegi panjang
Keliling = 210 m
lebar = 35 m
panjang = Keliling – lebar
2
panjang = 210 – 35
panjang = 105 – 35
panjang = 70 m
Luas = panjang × lebar
Luas = 70 × 35
Luas = 2.450 m²
5) b
a = 12 cm
t = 8 cm
Luas = a × t
Luas = 12 × 8
Luas = 96 cm²
6) d
t = 25 cm
a = 34 cm
Luas = 34 × 25
Luas = 17 × 50
Luas = 850 cm²
7) b
Trapesium siku²
t = 15 cm
s.a = 20 cm
s.b = 12 cm
s.m = √(t² + (s.a – s.b)²)
s.m = √(15² + (20 – 12)²)
s.m = √(225 + 64)
s.m = √289
s.m = 17 cm ← sisi miring
Keliling = t + s.a + s.b + s.m
Keliling = 15 + 20 + 12 + 17
Keliling = 35 + 29
Keliling = 64 cm
8) c
Belah Ketupat
d1 = 54 cm
d2 = 72 cm
s = 45 cm
Luas = d1 × d2
Luas = 54 × 72
Luas = 3.888
Luas = 1.944 cm²
Keliling = 4 × s
Keliling = 4 × 45
Keliling = 180 cm
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Penjelasan dengan langkah-langkah:
4) a
Persegi panjang
Keliling = 210 m
lebar = 35 m
panjang = Keliling – lebar
2
panjang = 210 – 35
2
panjang = 105 – 35
panjang = 70 m
Luas = panjang × lebar
Luas = 70 × 35
Luas = 2.450 m²
5) b
a = 12 cm
t = 8 cm
Luas = a × t
Luas = 12 × 8
Luas = 96 cm²
6) d
t = 25 cm
a = 34 cm
Luas = 34 × 25
Luas = 17 × 50
Luas = 850 cm²
7) b
Trapesium siku²
t = 15 cm
s.a = 20 cm
s.b = 12 cm
s.m = √(t² + (s.a – s.b)²)
s.m = √(15² + (20 – 12)²)
s.m = √(225 + 64)
s.m = √289
s.m = 17 cm ← sisi miring
Keliling = t + s.a + s.b + s.m
Keliling = 15 + 20 + 12 + 17
Keliling = 35 + 29
Keliling = 64 cm
8) c
Belah Ketupat
d1 = 54 cm
d2 = 72 cm
s = 45 cm
Luas = d1 × d2
2
Luas = 54 × 72
2
Luas = 3.888
2
Luas = 1.944 cm²
Keliling = 4 × s
Keliling = 4 × 45
Keliling = 180 cm