tolong jawab no 4 aja dan pakai cara ya....

a. luas = 1/2 x diagonal 1 x diagonal 2
    48    = 1/2 x 3x x 4x
     96   = 12x
        x   = 8

b. Panjang diagonal = diagonal 1 = 3 x 8 = 24
                                    diagonal 2 = 4 x 8 = 32