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TQ = √12² +9²
TQ= √225 = 15
QS = √PQ² + PS²
QS = √12² + 20²
QS = √544
QW = √QS² + SW²
QW = √(√544)² + 9²
QW = √625 = 25
TW² = TQ² + QW² - 2 x TQ x QW COS α
20² = 15² + 25² - 2 x 15 x 25 cos α
cos α = 3/5