If ∠a = 35°, what does ∠b equal?
∠b = ?°

Hello!
As you can see, b and a appear to form a right angle. This means they are complementary, and their angle measures add up to 90°. Le'ts subtract 35 from 90 to find b.
90-35=55
Therefore, [tex] \boxed {\angle b= 55 \circ} [/tex].
I hope this helps!