kak please tolong jawab soal saya cuma 1 kok secepatnya

AB = x
AC = OA = 7 + x

tan 30° = AB/OA
1/√3 = x/(7 + x)
7 + x = x√3
x√3 - x = 7
x(√3 - 1) = 7
x = 7/(√3 - 1)
x = 7/(√3 - 1) × (√3 + 1)/(√3 + 1)
x = 7(√3 + 1) / (3 - 1)
x = 7/2 (√3 + 1)
x = 9,562 m

Tinggi gedung = 9,562 m

jawaban

lihat gambar
tiinggi gedung = 7/2 (√3  + 1)