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A person standing on the bank of a river observes that the angle subtended by a tree on the opposite of bank is 60°. When he retires 40 m. from the bank, he finds the angle to be 30°. What is the breadth of the river ?
  • a)
    60m
  • b)
    40m
  • c)
    30m
  • d)
    20m
Correct answer is option 'D'. Can you explain this answer?
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If a person standing on the bank of a river observes that the angle subtended by a tree on the opposite bank is 60 degrees, it means that the person is seeing the tree from an angle of 60 degrees.

This angle is formed by a line drawn from the person's eye to the top of the tree and another line drawn from the person's eye to the base of the tree. The line connecting the person's eye to the top of the tree is the line of sight.

In this case, the person is standing on the bank of the river, which means that the line connecting the person's eye to the base of the tree is along the riverbank. The line connecting the person's eye to the top of the tree is along the line of sight.

Since the person is standing on the bank of the river, the line connecting the person's eye to the base of the tree is perpendicular to the riverbank. This forms a right triangle with the line connecting the person's eye to the top of the tree.

Therefore, the angle subtended by the tree on the opposite bank is 60 degrees.
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A person standing on the bank of a river observes that the angle subtended by a tree on the opposite of bank is 60°. When he retires 40 m. from the bank, he finds the angle to be 30°. What is the breadth of the river ?a)60mb)40mc)30md)20mCorrect answer is option 'D'. Can you explain this answer?
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A person standing on the bank of a river observes that the angle subtended by a tree on the opposite of bank is 60°. When he retires 40 m. from the bank, he finds the angle to be 30°. What is the breadth of the river ?a)60mb)40mc)30md)20mCorrect answer is option 'D'. Can you explain this answer? for Defence 2024 is part of Defence preparation. The Question and answers have been prepared according to the Defence exam syllabus. Information about A person standing on the bank of a river observes that the angle subtended by a tree on the opposite of bank is 60°. When he retires 40 m. from the bank, he finds the angle to be 30°. What is the breadth of the river ?a)60mb)40mc)30md)20mCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Defence 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A person standing on the bank of a river observes that the angle subtended by a tree on the opposite of bank is 60°. When he retires 40 m. from the bank, he finds the angle to be 30°. What is the breadth of the river ?a)60mb)40mc)30md)20mCorrect answer is option 'D'. Can you explain this answer?.
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