Ada yang bisa bantu no. 12?

Persegi panjang :
p = (2x - 1)
l = (x +3)
K= 2( p+ l)
46 = 2 ( 2x -1) + 2 ( x +3)
46= 4x - 4 +2x + 6
46 = 6x + 4
6x = 46 -4
x = 42/6 = 7

p= 2(7) - 1 = 14 -1 = 13 cm
l = 7 + 3= 10 cm

K= 2x(p+l)
46= 2x (2x-1+x+3)
46= 2 x ( 3x+2)
46= 6x + 4
46-4= 6x
42= 6x
x= 42÷6= 7

panjang= 2x-1= 2(7)-1= 13 cm
lebar= x+3= 7+3= 10 cm

jawaban: A