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Answer:
<BKC
Step-by-step explanation:
m<DKC = 20°
m<BKD = 70°
m<BKC = m<DKC + m<BKD (angle addition postulate)
m<BKC = 20° + 70° (Substitution)
m<BKC = 90°.
Therefore, the angle that equals 90° in the given figure is angle BKC.