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p+l+p+l=keliling
4x+3x+4x+3x=42
14x=42
x=42/14= 3cm
jadi panjangnya=4x=4 x 3=12
dan lebar =3x = 3 x 3 =9
luasnya = pxl=12 x 9=108cm^2 (pilihan b)
30.panjang sisinya=104/4=26
panjang seengah diagonalnya=
d1=48
d2=2 x7 =20
rumusnya= 1/2 d1 xd2
= 1/2 x 48 x 20
= 24 x 20 = 480 cm^2 (pilihan c)