= (88 cm – (2 × 12 cm)) : 2
= (88 cm – 24 cm) : 2
= 64 cm : 2
= 32 cm
Baca Juga: Kunci Jawaban Matematika Kelas 5 SD Halaman 220: Membuat Tabel Harga
b. Lebar = (Keliling – (2 × Panjang)) : 2
= (156 cm – (2 × 58 cm)) : 2
= (156 cm – 116 cm) : 2
= 40 cm : 2
= 20 cm