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Lesson Posted on 06/02/2018 Learn CBSE/Class 10
Find The Length Of BF (Very Important Question)
Sujoy D.
1. Strong concept building classes. 2. Weekly tests in weak areas for students to improve their confidence. 3....
Question:
Solution:
Lesson Posted on 06/02/2018 Learn Exam Coaching/NTSE exam Coaching
Find The Ratio AE: EC (Important For NTSE Olympiad)
Sujoy D.
1. Strong concept building classes. 2. Weekly tests in weak areas for students to improve their confidence. 3....
Question given below:
Solution 1:
Solution 2:
Solution 3:
Solution 4:
Draw a line from D parallel to BE cutting AC at P.
CDP and CBE are similar.
EP/EC = BD/BC = 3:5
Also, AFE and ADP are similar.
AE/EP = AD/FD = 2:1
Multiply both the equation from the top, so AE/EC = 6:5.
read lessLesson Posted on 31/01/2018 Learn CBSE/Class 9/Mathematics
Sujoy D.
1. Strong concept building classes. 2. Weekly tests in weak areas for students to improve their confidence. 3....
Q. ABC is an equilateral triangle with side length 6. If X is a point on side CA , what is the minimum value of BX² + XC² ?
Answer: Let's D is mid point of CA (BD = height = 3√3)
So, Bx^2 + Cx^2 = (3√3)^2 + Dx^2 + Cx^2 = 27 + Dx^2 + Cx^2
So minima = 27 + 2Dx.Cx (from AM GM)
Now (Dx + Cx) = 3
DX^2 +CX^2 = (9-2DX.CX)
2Dx.Cx = 9-2Dx.Cx
2Dx.Cx = 9/2
Ans: 27+9/2 = 63/2
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