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To find the missing angle, we can use the inverse tangent ratio:
tan⁻¹(opposite/adjacent) = θ
Given that the opposite side is 2 cm and the adjacent side is 5 cm, we have:
tan⁻¹(2/5) = θ
tan⁻¹(0.4) ≈ θ
θ ≈ 21 degrees
Therefore, the missing angle is approximately 21 degrees.