Question

In the diagram, find the values of a and b.​

Answer 1

m∠a = 67° , m∠b = 42°

Explanation:

∠a is alternate interior angle to ∠ECD

∠b is alternate interior angle to ∠BCD

so:

If AB || CD then:

m∠a = m∠ECD = 25° + 42° = 67°

m∠b = 42°