4 to 5 lines on fire fighters of class 2nd
Answers
Answer:
Let ;-
A = ( 1 , -1 , 3)
B = ( 2 , -4 , 5)
C = ( 5 , -13, 11)
If , all these points lie on the straight lines than ;-
=> AC = AB + BC
=> AB = √( 2-1 )² + ( -4 + 1)² +( 5-3 )²
=> AB = √ 1 + 9 + 4
=> AB = √ 14
=> AB = 2√5
=> BC = √ ( 5 - 2 )² + ( - 13 + 4 )² + ( 11 - 5 )²
=> BC = √ 9 + 81 + 36 = 3 √ 14
=> AC = √ ( 5 - 1 )² + ( - 13 + 1 )² + ( 11 - 3 )²
=> AC = √ 16 + 144 + 64
=> AC = 4 √ 14
=> AB + BC = AC
=> L. H. S = √ 14 + 3√ 14
=> L. H. S. = 4 √ 14 = AC
=> L. H. S. = R. H. S.
Therefore,
The given points are in a Straight line.
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Answer:
Firefighters or firemen are people whose job is to put out fires and rescue people. Besides fires, firefighters rescue people and animals from car wrecks, collapsed buildings, stuck elevators and many other emergencies. Firefighting is a job which requires bravery, strength, quick thinking and a wide range of skills.
