Respuesta :

18 degrees 18 degrees 18 degrees
Catya
The interior angles of a triangle add to equal 180°
ΔACE: has angle; ∠A , ∠C = 0.5A + 42 and ∠E

A + 0.5A + 42 + 90 = 180
1.5A +132 = 180
1.5A = 48
A = 32°