1. Luas = (2x+1)(2x+1) = 4x² + 4x + 1
Keliling = 4.2x+1 = 8x + 4
2. Panjang : 3x+2+3 = 3x+5
Keliling = 4.(3x+2)+3.2 = 12x+8+6 = 12x+14
Luas = (3x+2)(3x+5) = 9x² + 15x + 6x + 10 = 9x² + 21x + 10
3. Luas = 1/2.a.t = 1/2 (5x+6)(2x+5) = 1/2 (10x² + 37x + 30) = 5x² + 37/2x + 15
maaf klo salah..
