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I solved problem following way. Can someone confirm if my version is correct?
Tower Defense Game
let towerX = 2.0 let towerY = 13.0
let enemyX = 4.0 let enemyY = 9.0
let distanceX = (towerX - enemyX) * (towerX - enemyX) let distanceY = (towerY - enemyY) * (towerY - enemyY)
let distance = distanceX + distanceY
let root = sqrt(distance)