Here you also need to find adjacent corners.
Since one of them is five times larger than the second, and the sum is equal to 180º, then:
x is the value of the angle ∠1;
5x – the value of the angle ∠2;
x + 5x = 180;
6x = 180;
x = 180/6 = 30;
∠1 = 30º;
∠2 = 30º · 5 = 150º.
Answer: ∠1 = ∠3 = 30º, ∠2 = ∠4 = 150º.
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