Jawab sama pake caranya yak :D​

Jawaban:

1. 868 cm²

2. 557 cm²

3. 462 cm²

4. 616 cm²

Penjelasan dengan langkah-langkah:

1. Luas ½ Lingkaran = ½ × π × r × r

= ½ × 22/7 × 14 × 14

= 11 × 2 × 14

= 22 × 14

= 308 cm²

Luas Segitiga = a × t/2

= 28 × 40/2

= 28 × 20

= 560 cm²

Luas bangun keseluruhan

= 308 + 560

= 868 cm²

2. Luas Persegi = S × S

= 20 × 20

= 400 cm²

Luas ½ Lingkaran = ½ × π × r × r

= ½ × 3,14 × 10 × 10

= ½ × 3,14 × 100

= ½ × 314

= 157 cm²

Luas bangun keseluruhan

= 400 + 157

= 557 cm²

3. Luas Lingkaran Besar = π × r × r

= 22/7 × 14 × 14

= 22 × 2 × 14

= 44 × 14

= 616 cm²

Luas Lingkaran Kecil = π × r × r

= 22/7 × 7 × 7

= 22 × 7

= 154 cm²

Luas Daerah Arsiran

= 616 – 154

= 462 cm²

4. Luas ½ Lingkaran Besar = ½ × π × r × r

= ½ × 22/7 × 21 × 21

= 11 × 3 × 21

= 33 × 21

= 693 cm²

Luas ½ Lingkaran Kecil = ½ × π × r × r

= ½ × 22/7 × 7 × 7

= 11 × 7

= 77 cm²

Luas Daerah Arsiran

= 693 – 77

= 616 cm²

Semoga Membantu 😉