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प्रश्न
Find the angle made by a ladder of length 5m with the ground, if one of its end is 4m away from the wall and the other end is on the wall
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उत्तर
AC is the length of the ladder.
In the right ΔABC,
cos θ = `"BC"/"AC"`
cos θ = `4/5`
= 0.8
cos θ = 0.8000
θ = 36°52′
Angle made by a ladder with the ground is 36°52′
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