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[tex]1. \: keliling \\ = 5 + 4 + 2 \\ = 11 \: cm \\ luas \\ = \frac{1}{2} \times 4 \times 5 = 10 \: {cm }^{2} \\ \\ 2. \: luas \\ = \frac{1}{2} \times (24 + 14) \times 13 \\ = \frac{1}{2} \times 38 \times 13 \\ = 247 \: {cm}^{2} \\ \\ 3. \: luas \: persegi \: \\ panjang \\ = 14 \times 14 \times 3 \\ = 588 \: {cm }^{2} \\ lebar \: persegi \: panjang \\ = 588 \div 49 = 12 \\ keliling \: persegi \: \\ panjang \\ = 2 \times (49 + 12) \\ = 2 \times 61 \\ = 122 \: cm \\ \\ 4. \: keliling \\ =3.14 \times 24 \\ = 75.36 \: cm \\ \\ 5. \: a. keliling \\ = (4 \times 5) + (21 + 10 \\ + 13) \\ = 20 + 44 = 64 \: cm \\ \: luas \\ = (5 \times 5) + ( \frac{1}{2} \times 34 \\ \times 10) \\ = 25 + 170 = 195 \: {cm}^{2} [/tex]