Tolong cari Keliling sama Luas nya pakai cara ya ! poin 99 dibagi dua org
Ishmaa
1. Keliling = 20 cm + 5 cm + 15 cm + 5cm + 10 cm = 55 cm Luas = Luas persegi panjang + L. persegi = (20 cm x 5 cm) + (5cm x 5cm) = 100 cm² + 25 cm² = 125 cm²
2. Keliling = 42 cm + 15 cm + 10 cm + 15 cm + 42 cm + 50 cm = 174 cm Luas = Luas trapesium - luas persegi panjang = (1/2 . (50cm + 10 cm) . 30 cm) - (15 cm x 10 cm) = 1800 cm² - 150 cm² = 1650 cm²
3. Keliling setengah lingkaran = d = 22/7 . 42 cm = 132 cm Keliling bangun tsb = 42 cm + 42 cm + 42cm + 132 cm = 258 cm Luas = L. Persegi - L. setengah lingkaran = (42 cm x 42 cm) - (1/2. 22/7. 21 cm. 21cm) = 1764 cm² - 693 cm² = 1071 cm²
4. Keliling = 10 cm + 6 cm + 12 cm + 8 cm + 12 cm = 48 cm Luas = L.jajar genjang + L. segitiga = (8 cm x 10 cm) +(1/2. 8 cm . 6 cm) = 80 cm² + 24 cm² = 104 cm²
5. keliling setengah lingkaran = 3,14 x 20 = 62,8 cm Keliling bangun = 20 cm + 13 cm + 13 cm + 62,8 cm + 20 cm =128,8 cm
Luas = Luas persegi panjang + L. persegi
= (20 cm x 5 cm) + (5cm x 5cm)
= 100 cm² + 25 cm²
= 125 cm²
2. Keliling = 42 cm + 15 cm + 10 cm + 15 cm + 42 cm + 50 cm = 174 cm
Luas = Luas trapesium - luas persegi panjang
= (1/2 . (50cm + 10 cm) . 30 cm) - (15 cm x 10 cm)
= 1800 cm² - 150 cm²
= 1650 cm²
3. Keliling setengah lingkaran = d
= 22/7 . 42 cm
= 132 cm
Keliling bangun tsb = 42 cm + 42 cm + 42cm + 132 cm = 258 cm
Luas = L. Persegi - L. setengah lingkaran
= (42 cm x 42 cm) - (1/2. 22/7. 21 cm. 21cm)
= 1764 cm² - 693 cm² = 1071 cm²
4. Keliling = 10 cm + 6 cm + 12 cm + 8 cm + 12 cm = 48 cm
Luas = L.jajar genjang + L. segitiga
= (8 cm x 10 cm) +(1/2. 8 cm . 6 cm)
= 80 cm² + 24 cm²
= 104 cm²
5. keliling setengah lingkaran = 3,14 x 20 = 62,8 cm
Keliling bangun = 20 cm + 13 cm + 13 cm + 62,8 cm + 20 cm =128,8 cm