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Answer:
angle S = 180° - (21° + 48°) = 180° - 69° = 111°
r/sin(21°) = 45/sin(111°)
r = 45sin(21°)/sin(111°) = about 17.2
t/sin(48°) = 45/sin(111°)
t = 45sin(48°)/sin(111°) = about 35.8