# What are the four basic constructions?

## What are the four basic constructions?

Basic Constructions: Angle Bisector, Perpendicular, Videos and Examples.

## How are compasses used in construction?

Compasses are a drawing instrument used for drawing circles and arcs. It has two legs, one with a point and the other with a pencil or lead. You can adjust the distance between the point and the pencil and that setting will remain until you change it.

What are the 8 basic constructions?

Constructions

• Line Segment Bisector and Right Angle. Angle Bisector.
• Inscribe a Circle in a Triangle. Circumscribe a Circle on a Triangle.
• Tangents to Point Outside Circle. Tangent to Point on Circle.

How do you construct a rectangle with a compass and a ruler?

Identify its correct sequence.

1. Join these cuts with a line CD and rectangle ABCD is formed.
2. Draw a straight line AB of length 10 cm.
3. Draw perpendicular lines at A and B using protractor.
4. Using compass cut arc at the perpendicular from A and B of lengths 8 cm.

### Which of the following angles can be constructed by ruler and compass?

Answer. Answer: 90 degree angle can be constructed using a ruler and compass.

### How do you construct a rectangle with two sides?

Construct a rectangle when two adjacent sides are given

1. Draw a side of given length (say) CL.
2. Draw side LU (say) of given length perpendicular to CL at L.
3. Draw side CE (say) of length equal to LU and perpendicular to CL at C.
4. Draw side UE.

How to construct a compass in AutoCAD?

Ruler and Compass Constructions 1 Step 1: Put the compass point on A and open it so that the pencil touches B. So you have “measured” the length of AB… 2 Step 2: Leaving the compass point on A, draw an arc with the pencil roughly where you think the other vertex (corner) of… More

How to draw an angle with two compasses?

Start by opening your compasses to any length and drawing an arc on each line making up the angle. Label these points A and B. Now, leaving the length of the compasses the same, put the compass point on A and draw an arc in the middle. Then put the compass point on B and draw an arc in the middle which crosses the first.

#### How do you cross an arc with a compass?

Reposition the compass on one of the new points and draw an arc above the line, roughly where your perpendicular line will go. Reposition the compass onto the second point, and draw a second arc to cross the first. This one can be much shorter. Draw a ruled line to join the starting point on the first line to the point marked by the crossed arcs.

#### How to measure the length of AB with the compasses?

Step 1: Put the compass point on A and open it so that the pencil touches B. So you have “measured” the length of AB with the compasses. Be careful not to open or close the compasses at all now! Step 2: Leaving the compass point on A, draw an arc with the pencil roughly where you think the other vertex (corner) of the triangle is going to be.