Question

Find what the question is asking

Answer 1

Answer:

$\phi=\theta a2$

Step-by-step explanation:

see the attached figure to better understand the problem

we know that

In the figure ABCD

$m$

$m$

$m$

$m$

Remember that the sum of the internal angles in a quadrilateral is equal to $360\°$

so

$\theta a1+90\°+90\°+90\°+\phi=360\°$

$\theta a1+\phi=90\°$ -----> complementary angles

and

$\theta a1+\theta a2=90\°$ -------> complementary angles too

so

$\phi=\theta a2$