11. In Fig. 10.11, find the distance of D from A, unit of
length is cm, (AB = 2, BC = 4, CD = 2).
A
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Given:
AB = 2 units
BC = 4 units
CD = 2 units
To find:
Distance of D from A = ?
Solution:
First of all, let us make one construction in the given figure.
Join the line from A to D which cuts the line BC at E.
Please refer to the attached figure now.
There are 2 right angled triangles here, .
By symmetry, the line BC is divided into 2 equal parts by E i.e. BE = EC = 2.
Using pythagorean theorem in :
Using pythagorean theorem in :
Now, the side AD = AE + ED =
So , the answer is
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