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Divyansh Dubey 2 years, 11 months ago
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Ayushi Sharma 2 years, 11 months ago
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Preeti Dabral 2 years, 11 months ago
Sound is a form of energy which produced by vibration and produces sensation of hearing in our ear.
Abhi Yadav 2 years, 9 months ago
Harsh Kumar 2 years, 10 months ago
Nikhil Parjapat 2 years, 10 months ago
Posted by Nilanjna Singh 2 years, 11 months ago
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Preeti Dabral 2 years, 11 months ago
Given: ABCD is a square, where {tex}\angle{/tex}PQR = 90o and PB = QC = DR
To prove: (i) QB = RC (ii) PQ = QR
(iii) {tex}\angle{/tex}QPR = 45o
Proof:
- Here,
BC = CD … (Sides of square)
CQ = DR … (Given)
BC = BQ + CQ
{tex}\therefore{/tex} CQ = BC − BQ
{tex}\therefore{/tex} DR = BC – BQ .......(1)
Also,
CD = RC + DR
{tex}\therefore{/tex} DR = CD - RC = BC - RC ........(2)
From (1) and (2), we have,
BC - BQ = BC - RC
{tex}\therefore{/tex} BQ = RC - Now in {tex}\triangle{/tex}RCQ and {tex}\triangle{/tex}QBP
we have, PB = QC … (Given)
BQ = RC … [from (i)]
{tex}\angle{/tex}RCQ = {tex}\angle{/tex}QBP … 90o each
Hence by SAS(Side-Angle-Side) congruence rule,
{tex}\triangle{/tex}RCQ {tex}\cong{/tex} {tex}\triangle{/tex}QBP
{tex}\therefore{/tex} QR = PQ … (by cpct) - {tex}\triangle{/tex}RCQ {tex}\cong{/tex} {tex}\triangle{/tex}QBP and QR = PQ … [from (2)]
{tex}\therefore{/tex} In {tex}\triangle{/tex}RPQ,
{tex}\angle{/tex}QPR = {tex}\angle{/tex}QRP ={tex}\frac{1}{2}{/tex}(180o - 90o) = {tex}\frac{90}{2}{/tex}= 45o
{tex}\therefore{/tex} {tex}\angle{/tex}QPR = 45o
Posted by Kasturi Pathak 2 years, 11 months ago
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Posted by Aditya Pratap Singh 2 years, 11 months ago
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Preeti Dabral 2 years, 11 months ago
It is actually not according to the book.Before serving into the army he actually works as a messenger into the world wars and because of his bravery he was posted to the post of an corporal and he also received many medals and the president of Russia(Hindenburg) gave him the post of the chancellor of the whole assembly and in this he actually came into power.
Abhay Kumar 2 years, 11 months ago
Posted by Anil Kundu 2 years, 11 months ago
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Preeti Dabral 2 years, 11 months ago
He gave the intruder the impression that the police were looking for him and he expected a telephone call from a friend informing the police's arrival. So when the telephone rang, he hurried the intruder into the cupboard and told him that it was connected to the garage which was an escape route.
Posted by Somnath Das 2 years, 11 months ago
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Preeti Dabral 2 years, 11 months ago
Making a mountain out of a molehill is an idiom referring to over-reactive, histrionic behaviour where a person makes too much of a minor issue. It seems to have come into existence in the 16th century.
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Preeti Dabral 2 years, 11 months ago
Artificial Intelligence is the theory and development of computer systems able to perform tasks normally requiring human intelligence, such as visual perception, speech recognition, decision-making, and translation between languages.
Posted by Yogesh Kori 2 years, 11 months ago
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Preeti Dabral 2 years, 11 months ago
A self-reflection is a process in which you look back on your science work and examine the strengths and weaknesses of the work. You will be choosing samples of your science work, reflecting back on it, and putting the items in your science portfolio.
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Preeti Dabral 2 years, 11 months ago
Entrepreneurship development is the means of enhancing the knowledge and skill of entrepreneurs through several classroom coaching and programs, and training. The main point of the development process is to strengthen and increase the number of entrepreneurs.

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Riya Kumari 2 years, 11 months ago
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