tolong dijawab pakai cara ya kak, terutama soal d

a.
AB^2 = 41^2 - 9^2
AB^2 = 1.681 - 81
AB^2 = 1.600
AB = akar 1.600
AB = 40 cm
AC = AB = 40 cm

b.
L.ABO = 1/2 × 40 × 9
= 180 cm^2

c.
L.ABOC = 2 × 180
= 360 cm^2

d. menggunakan perbandingan senilai
(1/2 BC)/AB = BO/AO
(1/2 BC)/40 = 9/41
1/2 BC = 9/41 × 40
BC = 9/41 × 40 × 2
BC = 720/41
BC = 17,56 cm