tolong caranya ya no 14

Panjang = 8cm
Levar = 7cm
Jadi, luas = 8×7 = 56cm² (C)

Maaf ya klau salah:)

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K = 2 x ( p + l )
30 = 2 x (( 3x - 1 ) + ( 2x + 1 ))
30 = ( 6x - 2 ) + ( 4x + 2 )
30 = 10x
x = 30/10
x = 3 cm

Panjang
= 3x - 1
= 3(3) - 1
= 8 cm

Lebar
= 2x + 1
= 2(3) + 1
= 7 cm

Luas persegi panjang
= p x l
= 8 cm x 7 cm
= 56 cm²
Opsi C [tex] [/tex]

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