hitung dgn bener ya kk lengkapi bagian yg kosong jika diketahui ukuran berikut terdapat pada bangun persegi panjang! 1.P=12 cm Lebar=...... K=42 cm L=.... 2.P=.

1. K = 2(p+l)
42 = 2(12+l)
21 = 12+l
l = 9
L = 12 x 9 = 108 cm^2

2. L = pxl
91 = p x 7
91/7 = p
p = 13 cm
K = 2 (p+l)
K = 2(13+7)
K = 2.20 = 40 cm

3. L = p x l
228 = 19 x l
228/19 = l
l = 12 cm
K = 2(p+l)
K = 2(19+12)
K = 2.31 = 62 cm

Semoga Membantu :v

1) K = 2p + 2l
=42= 24 + 2l
=24+ 2l = 42
=2l = 42-24
=2l =18
=lebar= 9cm
=luas= p x l
=9 x 12 = 108 cm

2)Luas = p x l
=91 = 7p
=7p =91
= panjang= 13cm
=keliling = 2p+2l
=2(13) +2(7)
=26 + 14
=40 cm

3)Luas = p x l
=228 = 19l
=19l =228
=lebar = 12cm
keliling = 2p+2l
= 2(19)+2(12)
=38 + 24
=62 cm