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If △ A B C △ ⁡ A ⁣ B ⁣ C ≌ △ D E F △ ⁡ D ⁣ E ⁣ F , and m∠A = (x + 30)°, m∠C = 45°, and m∠D = 80°, what is the m∠A?

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Example:

Exterior angles of a triangle supplementary angles (equates to 180°).

The sum of the three interior angles in a triangle is always 180°.

180 - 144 = 36

180 - 72 = 108

then,

x + 36 + 108 = 180

x + 144 = 180

x = 36

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