গাণিতিক যুক্তি MCQ
A ladder is leaning against a wall. It makes a 60° angle with the wall. If the distance between foot of ladder and wall is 5.5 meters, find the length of the ladder.
সঠিক উত্তর
11 m
Let BC be the wall and AC be the ladder.∠BAC = 60° and AB = 5.5 meterIn ΔABC,cos60° = AB/AC⇒ 1/2 = 5.5/AC⇒ AC = 5.5 × 2∴ AC = 11