Class 08 Practical geometry Figures on the same base

 

PRACTICAL GEOMETRY

Activity-1 :

Subtopic: Figures on the same base.

DATE:

 

AIM / Objective:

To construct a square & rhombus

 

MATERIALS REQUIRED:

Pencil, scale, eraser

 

PREREQUISITE KNOWLEDGE:

Concept of geometry

 

PROCEDURE:

Description:

(i) Construct a square and a rhombus on the same base of 6 cm.

(ii) Construct a parallelogram and rectangle on the same base of 9 cm and between the same parallels.

LEARNING ASSESSMENT:

(i) How many such rhombuses can be constructed?

 

(ii) How many parallelograms can be drawn on the same base and between the same parallels?

SOLUTION:

 

Class 08 Understanding Quadrilaterals Area of parellelogram = B x H

 

Understanding Quadrilaterals

 

Activity-3 :

Subtopic: Area of parellelogram = B x H

DATE:

 

AIM / Objective:

To derive the formula to find the area of parallelogram

 

MATERIALS REQUIRED:

Pencil, scale, eraser

 

PREREQUISITE KNOWLEDGE:

Concept of parallelogram

 

PROCEDURE:

• Draw a parellelogram ABCD and cut it

• Fold ABCD such that DE ⊥ AB

• Cut ΔAED and paste along DEBC to get DEXC

Ar (ABCD) = Ar (DEXC)

= EX ⋇ CX

= AB x DE

= Base x Height

 

LEARNING ASSESSMENT:

 

Derive the formula to find the area of the parallelogram

 

 

SOLUTION:

Class 08 Understanding Quadrilaterals Angle sum property of a concave quadrilateral

 

Understanding Quadrilaterals

 

Activity-2 :

Subtopic: Angle sum property of a concave quadrilateral.

 

DATE:

 

AIM / Objective:

To Prove that angle sum property of a quadrilateral

MATERIALS REQUIRED:

Pencil, scale, eraser

 

PREREQUISITE KNOWLEDGE:

Concept of quadrilaterals

 

PROCEDURE:

 

Description:

On a coloured sheet of paper draw a convex quadrilateral ABCD.

Cut out the four angles and paste these cutouts so that there is no gap between them and write the observation.

 

LEARNING ASSESSMENT:

Prove that angle sum property of a quadrilateral is ______

 

SOLUTION:

Class 08 Understanding Quadrilaterals To locate various convex and concave polygons by paper folding

 

Understanding Quadrilaterals

 

Activity-1 :

Subtopic: To locate various convex and concave polygons by paper folding.

DATE:

 

AIM / Objective:

To locate various convex and concave polygons

 

MATERIALS REQUIRED:

Pencil, scale, eraser

 

PREREQUISITE KNOWLEDGE:

Concept of polygons

 

PROCEDURE:

 

Description:

 

Take a rectangular sheet of paper. Fold it in any way and then unfold it. Draw a line on the crease using a ruler and pencil. Repeat this process 7 more times.

Mark the points of intersection as A, B, C, D and so on.

 

LEARNING ASSESSMENT:

 

Identify polygons and identify whether they are convex or concave.

 

SOLUTION: