Q. 17

# Construct a trian

Step 1. At first drawn a base line BC of length 5.5 cm with the help of scale.

Step 2. Taking B as center draw an arc of radius 5 cm with the help of compass. Similarly taking C as center draw a arc of radius 6.5 cm with the help of compass.

Join AB and AC thus completing the triangle ABC.

Step 3. A ray BX is drawn making an acute angle with BC opposite to vertex A. Five points B1 , B2 , B3, B4, and B5 at equal distance is marked on BX.

Step 4. B3 is joined with C to form B3 C as 3 point is smaller. B5 C1 is drawn parallel to B3 C as 5 point is greater.

Step 5:C1A1is drawn parallel to CA.

Thus, A1BC1 is the required triangle.

Justification:

Since the scale factor is ,

We need to prove,

By construction,

… (1)

Also, A1C1 is parallel to AC.

So, this will make same angle with BC.

A1C1B = ACB …. (2)

Now,

In ΔA1BC1 and ΔABC

B = B (common)

A1C1B = ACB (from 2)

ΔA1BC1 ΔABC

Since corresponding sides of similar triangles are in same ratio.

From (1)

Hence construction is justified.

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