Q. 33.9( 18 Votes )

Construct a triangle of sides 4 cm, 5 cm and 6 cm and then a triangle similar to it whose sides are (2/5) of the corresponding sides of it.

Answer :

Steps of Construction:

Step I: AB = 6 cm is drawn.

Step II: With A as a centre and radius equal to 4cm, an arc is draw. Again, with B as a centre and radius equal to 5 cm an arc is drawn on same side of AB intersecting previous arc at C.

Step III: AC and BC are joined to form ΔABC.

Step IV: A ray AX is drawn making an acute angle with AB below it.

Step V: 5 equal points (sum of the ratio = 2 + 3 =5) is marked on AX as A1 A2....A5

Step VI: A5B is joined. A2 B' is drawn parallel to A5B and B'C' is drawn parallel to BC.

ΔAB'C' is the required triangle



C = C' and B = B' (corresponding angles)

Thus ΔAB'C' ~ ΔABC by AAA similarity condition

From the figure,

Hence Proved.

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