If ABCD is congruent to QRST, it means that their corresponding angles are congruent. So,
m<A = m<Q
x - 10 = 2x - 30
30 - 10 = 2x - x
20 = x
So, <A = x - 10 = 20 - 10 = 10 degrees.
If ABCD≅ QRST, m<A = x-10, and m<Q=2x-30, what is <A?
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