Whoever is very good at math can you cause i'm confused

Given
< C= <B/3
< B= < 3Ceqn(i)

Since consecutive angles of parallelogram are supplementary :
<C +<B=180
<C+ < 3C =180
< C=180/4
< C=45°

So in eqn(i),

<B=3×45=135°

Since <A &<C are opposite angles of a parallelogram,they are equal.

<C =<A=45°↪Ans 1

Similarly for <B &<D,

<B=<D=135°↪Ans 2

-18 i know your in 7th grade just did question yesterday

Step-by-step explanation: