Question

what is the relationship between a and b​

Answer 1

$\huge\purple {Vertical\: Angles }$

hope it helps you......

Answer 2

Given,

A quadrilateral.

To find,

The relationship between ∠a and ∠b.

Solution,

We know,

Vertical angles are angles opposite each other where two lines cross.

From the given figure.

We see that,

∠a=∠b

(Vertical Angles)

Hence ∠a=∠b is a pair of vertical angles.