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Jawaban:
1.
Penjelasan dengan langkah-langkah:
1.
- bangun 1 ( persegi panjang)
L = p × l
= 50 × 23
= 1.150 cm²
- bangun 2 ( persegi )
L = s × s
= 20 × 20
= 400 cm²
• luas bangun gabungan = 1.150 + 400 = 1.550 cm²
• keliling = 50 + 23 + 16 + 20 + 20 + 20 + 14 + 23
= 186 cm
2.
- bangun 1 ( persegi panjang )
L = p × l
= 8 × 5
= 40 cm²
- bangun 2 ( persegi panjang)
L = p × l
= 3 × 2
= 6 cm²
- bangun 3 ( persegi panjang )
L = p × l
= 5 × 4
= 20 cm²
• luas bangun gabungan = 40 + 6 + 20 = 66 cm²
• keliling = 8 + 10 + 4 + 5 + 7 + 2 + 3 + 3
= 42 cm
3.
- bangun 1 ( persegi panjang)
L = p × l
= 42 × 10
= 420 cm²
- bangun 2 ( persegi panjang)
L = p × l
= 40 × 28
= 1.120 cm²
• luas bangun gabungan = 420 + 1.120 = 1.540 cm²
• keliling = 42 + 10 + 21 + 28 + 40 + 28 + 23 + 10
= 200 cm
4.
- bangun 1 ( persegi panjang)
L = p × l
= 15 × 10
= 150 cm²
- bangun 2 ( persegi panjang)
L = p × l
= 10 × 5
= 50 cm²
• luas bangun gabungan = 150 + 50 = 200 cm²
• keliling = 15 + 10 + 25 + 5 + 10 + 5 = 70 cm