Respuesta :

Answer:

A=20

Step-by-step explanation:

180-110=70

90+70=160

180-160=20

Hi1315

Answer:

20°

Step-by-step explanation:

We know that the exterior angle of a triangle is equal to the sum of interior opposite angles.

<B + <A = <C

90° + <A = 110°

<A = 110° - 90°

<A = 20°

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