Answer:
a=35°
b=55°
c=110°
Step-by-step explanation:
∡a=35° because they are opposite angles by the vertex
∡a +∡b+90°=180° (by definition of internal angles of a triangle)
35°+∡b+90°=180°
∡b=180°-90°-35°
∡b=90°-35°
∡b=55°
∡c+70°=180 because they form a straight angle
∡c=110°
