Tolong dong no.7 besok dikumpulkan

alas =
[tex] \sqrt{ {20}^{2} - {12}^{2}} = \sqrt{(20 + 12)(20 - 12)} = \sqrt{32(8)} = \sqrt{ {8}^{2} (4)} = \\ 16[/tex]
luas = 1/2 × 16 × 12 = 96