Question
The angle of elevation of a tower from a certain point
of bus stand is 30°. When a man walks 5m ahead in the direction of the tower, the angle of elevation becomes 60°. What is the height of the tower?Solution
Let, the height of the post = AB = ‘h’ m From ΔACB, ∠ACB = 30° [∵ given] tan ∠ACB = perpendicular/base ⇒ tan 30° = AB/BC ⇒ 1/√3 = h/BC ⇒ BC = h√3 ... (1) From ΔADB, ∠ADB = 60° [∵ given] tan ∠ADB = perpendicular/base ⇒ tan 60° = AB/BD ⇒ √3 = h/BD ⇒ BD = h/√3 ... (2) According to the question: BC - BD = 5 ⇒ h√3 - h/√3 = 5 ⇒ 2h/√3 = 5 ⇒ h = (5√3)/2 m
Select the correct indirect form of the given sentence.
She said to her brother, “Who do you think will win the best all-rounder award this...
Select the most appropriate indirect form of the given sentence.
“What sort of a house are you looking for, Mr. Barrington?” said the house...
My friend said to me, "For me running is like therapy."
She said to her friend, "What can I do to help you?"
Ramesh asked me to bring him a glass of water.
"Well ,well," He said. "A strange man!"
You are making your life more difficult.
Select the option that expresses the given sentence in direct speech.
He asked me when I had booked the flight tickets.
He said, "How I wish they would come!"
Choose the option that is the indirect form of the sentence.
Akshay said, “I am making biryani today.”
Relevant for Exams:
