kak tolong sekarang pliz nomor 2

[tex]ao = \sqrt{ {ad}^{2} - {od}^{2} } \\ = {20}^{2} - {16}^{2} \\ = 400 - 256 \\ = 144 \\ \\ ao = \sqrt{144} = 12[/tex]
L=1/2 x ac x bd
=1/2 x 42 x 32
=672m^2