Penjelasan dengan langkah-langkah:
12. js = jp/skala
panjang sesungguhnya
= 10cm/1:250
= 10×250
= 2500cm²
=25m²
lebar sesungguhnya
= 8cm/1:250
= 8×250
= 2000cm²
=20m²
luas sesungguhnya = 25m²× 20m²
= 500m²
13.
keliling bingkai 1
= 2(p+l)
= 2( 5dm + 3dm)
= 2 (50cm+ 30cm)
= 2 (80cm)
= 160cm
keliling bungkai 2
=2(p+l)
=2(40cm+20cm)
=2 (60cm)
=120cm
pita sisa = pita semua - pita dipakai
= 5,5 m - (160cm+120cm)
=550cm -280cm
= 270cm
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Penjelasan dengan langkah-langkah:
12. js = jp/skala
panjang sesungguhnya
= 10cm/1:250
= 10×250
= 2500cm²
=25m²
lebar sesungguhnya
= 8cm/1:250
= 8×250
= 2000cm²
=20m²
luas sesungguhnya = 25m²× 20m²
= 500m²
13.
keliling bingkai 1
= 2(p+l)
= 2( 5dm + 3dm)
= 2 (50cm+ 30cm)
= 2 (80cm)
= 160cm
keliling bungkai 2
=2(p+l)
=2(40cm+20cm)
=2 (60cm)
=120cm
pita sisa = pita semua - pita dipakai
= 5,5 m - (160cm+120cm)
=550cm -280cm
= 270cm