Tolong banget, please dijawab pleaseee

L= ½ a x t
= ½ 9 x 12
=54/2 = 27
27 x 2 = 54

luas segitiga ABD
= 1/2 (9)(12)
= 54

panjang BD
[tex] \sqrt{25 {}^{2} - 9 {}^{2} } [/tex]
=23,3


maka luas segitiga BCD
=1/2(23.3)(9)
=104,85