Maths-
General
Easy

Question

In ∆ABC, ∠ABC = 90° AD is the median to BC and CE is the median to AB. If AC = 5 cm and AD =fraction numerator 3 square root of 5 over denominator 2 end fraction  cm, find CE.

hintHint:

Pythagoras' theorem states that “In a right-angled triangle,  the square of the hypotenuse side is equal to the sum of squares of the other two sides“. The sides of this triangle have been named Perpendicular, Base and Hypotenuse. Here, the hypotenuse is the longest side, as it is opposite to the angle 90°.
If a is the perpendicular, b is the base, and c is the hypotenuse, then according to the definition, the Pythagoras Theorem formula is given as
c2= a2 + b2

The correct answer is: Hence, the value of CE is 2√5 cm.




    It is given that AD is the median to BC. So, BD = CD. It is also given that CE is the median to AB. So, AE = BE
    Also, AC = 5 cm and AD = fraction numerator 3 square root of 5 over denominator 2 end fraction  cm
    Applying Pythagoras theorem in △ABD
    AD2 = BD2 + AB2
    AD squared equals open parentheses fraction numerator B C over denominator 2 end fraction close parentheses squared plus AB squared
    AD squared equals 1 fourth BC squared plus AB squared
    Applying Pythagoras theorem in △BCE
    CE2 = BE2 + BC2
    CE squared equals 1 fourth AB squared plus BC squared
    Adding equations (1) and (2)
    A D squared plus C E squared equals 1 fourth B C squared plus A B squared plus 1 fourth A B squared plus B C squared
    A D squared plus C E squared equals 5 over 4 open parentheses A B squared plus B C squared close parentheses
    As △ABD is a right-angled triangle. So AB2 + BC2 = AC2
    A D squared plus C E squared equals 5 over 4 A C squared
    open parentheses fraction numerator 3 square root of 5 over denominator 2 end fraction close parentheses squared plus C E squared equals 5 over 4 cross times 5 squared
    C E squared equals 125 over 4 minus 45 over 4 equals 20
    CE equals square root of 20 equals 2 square root of 5 cm
    final answer:
    text  Hence, the value of CE is  end text 2 square root of 5 cm text .  end text

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