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SOLUTION:
Since ∆ABC ≅ ∆DEF, then:
- m∠B and m∠E = 30°
- m∠C and ∠F = 75°
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Therefore,
- m∠D = 180° – (m∠E + m∠F)
- m∠D = 180° – (30° + 75°)
- m∠D = 180° – 105°
- m∠D = 75°
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