Answer:
∠A = 126°
Explanation:
Firstly, we can calculate that ∠B is 54° because opposite angles are the same, and a circle is 360° so let subtract these two angles first:
360 - 54 - 54 = 252
Now, ∠A = ∠B so:
252 ÷ 2 = 126
So ∠A = 126°
Another way of calculating this is simply subtracting 54 from 180° as they are both on a straight line and must add up to 180°:
180 - 54 = 126°
Hope this helps!