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Question

Construct a triangle with sides 5 cm,6 cm and 7 cm and then another triangle whose sides are 75 times of the corresponding sides of the first triangle. Write down the steps of construction.

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Solution

Making the triangle
1) Draw a line segment AB = 5 cm
2) Draw an arc at 6 cm from point A. Draw an arc at 7 cm from point B so that it intersects the previous arc
3) Joint the point of intersection from A and B.
This gives the required triangle ABC.
Dividing the base
4) Draw a ray AX at and acute angle from AB.
5) Plot seven points on AX; so that AA1=A1A2=A2A3=A3A4=A4A5=A5A6=A6A7.
6) Join A5 to B.
7) Draw a line from point A7 parallel to A5B so that it joins AB' (AB extended to AB').
8) Draw a line B'C' BC.
Triangle AB'C' is the required triangle

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