Question

In triangle ABC, <BAC=70,and <ABC=45.what will BCA be equal to ...?

Answer 1

<abc+<bac+<bca=180
45+70+<bca=180
115+<bca=180
<bca=180-115
=65

Answer 2

according to properties <a+<b+<c=180°
So,<a+<b+<c=180°
=70+45+<c=180°
=115+<c=180°
=<c=180-115
=<c=65°
So,<BCA is 65°