Question

Arrange the following steps of construction of perpendicular lines in the correct order.
1. Draw a line using a ruler and mark a point.
2. Through the marked point draw a line along the edge.
3. Placing the ruler tightly and slide the set square along the ruler till the edge of the set square touches the marked point.
4. Place the ruler on the line and place one edge of a set square along the line.
5. Measure and check whether the obtained angle is ${90}^{\circ }.$

• A. 1, 2, 3, 5, 4
• B. 1, 4, 3, 2, 5
• C. 3, 2, 4, 1, 5
• D. 1, 4, 3, 5, 2

Answer 1

The correct option is B 1, 4, 3, 2, 5

The correct order is 1, 4, 3, 2, 5
Step 1:
Draw a line AB and mark a point P

Step 2:
Place the ruler on line AB and place one edge of the set square along the line.

Step 3:
Place the ruler tightly and slide the set square along the ruler till the edge of the set square touches the point P.
Step 4: Through P, draw a line PQ along the edge.

Step 5:
We obtain a line PQ which is perpendicular to AB. Measuring $\angle APQ$ we find it is ${90}^{\circ }.$