ntar kukasih terbrainly, bantuin trigonometri. thx!

ABD = 90° - BAD = 45°

DBE = 180° - ABC - ABD = 60°

BEA = 90° - DBE = 30° ✓

CAE = 90° - BEA = 60° ✓

BD = AB cos ABD = 1 × 1/2 √2 = 1/2 √2 cm ✓

DE = BD/ tan BEA = 1/2 √2 . √3 = 1/2 √6 cm ✓

AE = AD + DE = 1/2 √2 + 1/2 √6 = 1/2 √2 (1 + √3) cm

AC = AE sin BEA
AC = 1/2 √2 (1 + √2) . 1/2
AC = 1/4 √2 (1 + √2) cm