## CBSE Class 7 Maths Chapter 10 Practical Geometry Revision Notes

If you are looking forward to scoring excellent marks in your Class 7 Maths Exams then it becomes very significant to understand the importance of Revision. Revision is very important as it helps you remember all the important chapters and co-related concepts that you have learned earlier and for the purpose of Revision, Revision Notes are always considered the best as they make your learning easy and convenient.

Chapter 10 of CBSE Class 7 Maths is Practical Geometry. Swiflearn offers the best and most reliable CBSE Class 7 Maths Chapter 10 Practical Geometry Revision Notes that will make students understand all the important topics & concepts of this chapter and will help them in higher studies also. Free CBSE Class 7 Maths Chapter 10 Practical Geometry Revision Notes provided here are prepared under the auspices of our Excellent Teachers keeping in mind the latest CBSE guidelines.

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**Partial Geometry**

**Introduction**

The word ‘Geometry’ is derived from two Latin words, ‘geo’ + ‘metron’ meaning *earth &* *measurement*. This implies it is concerned with the properties and relations of points, lines, surfaces and solids.

**Line segment **

Line segment is a straight path with two end points.

**Intersecting line**

If two distinct line meet or cross at a point they are called intersecting line.

**Constructing a Line**

*Drawing a line segment of 3.9 cm*

*
*Step 1: Draw a line l. Mark a point ‘A’ on the line l.

Step 2: Place the pointer of the compass on the zero mark of the ruler. Open it to place the point of pencil up to 3.9 cm.

Step 3: Taking care that the opening of the compass has not changed, place the pointer on A and swing an arc to cut l at B.

Step 4: We got a portion AB, this is our line segment AB of required length.

**Constructing a Copy of Given Segment.**

Step 1: Draw a line segment CD of any length.

Step 2: Fix the pointer of compass on C and the pointer of pencil on D. Now, our compass has the length of segment CD. Compass opening is equal to the length of line segment CD.

Step 3: Now, Draw a line l and Mark a point A on the line l. Now, without changing the compasses setting, place the pointer on A.

Step 4 : Swing an arc that cuts l at a point B. AB Thus formed is a copy of CD.

**Constructions of Triangles**

*Constructing a scalene triangle when base, one base angle and the sum of the lengths of other two sides are given.*

**Construction:**

Draw the line segment BC which is our base BC. Now at point B make an angle, say XBC equal to the given angle.

Cut a line segment BD equal to AB + AC from the ray BX.

Join DC and make an angle DCY equal to BDC.

Let CY intersect BX at A

ABC is the required triangle.

### CBSE Class 7 Maths Chapter 10 Practical Geometry Revision Notes PDF