tolong jwabkan yaa beserta caranya

a. AB2 = BD.BC
= 7×11
AB = √77 cm
b. AC2 = CD.CB
= 4×11
AC = √44
= √4.11
= 2 √11 cm
c. AD2 = BD.CD
= 7×4
AD = √28
= √4.7
= 2 √7 cm
d. Luas = 1/2×a×t
= 1/2× √77 × 2√11
= √77 × √11
= 847 cm2
* 2 nya itu kuadrat
kalau ragu coba liat jawaban lain/ dikoreksi lgi