Summary

SUMMARY

• If any two points on a circle are joined by a line segment, then the line segment is called a ‘chord’.

• A diameter of a circle divides it into two equal parts. It is the longest chord of a circle.

• A part of the circumference of a circle is called the circular arc.

• The plane surface that is enclosed between two radii and the circular arc of a circle is called a ‘sector’.

• The angle made by the sector with the centre of the circle is called the ‘central angle’.

• The perimeter of a combined shape is the sum of all the lengths of the sides that form a closed boundary.

• The area of combined shapes is nothing but the sum of all areas of the simpler shapes in it

• The shapes which have three dimensions namely length, breadth and height are called three dimensional shapes (or) simply called as 3-D shapes.

• A cube has 6 faces, 12 edges and 8 vertices.

ICT CORNER

“Through this activity you will know about how to find the perimeter and area of the sectors.”

Step-1 Open the Browser and type www.Geogebra.com (or)scan the QR CODE given below.

Step-2 Type Area of sector on the search column

Step-3 Move the radius slide and degree slide. You will get various results.

Go through the remaining worksheets given for this chapter

Web URL Measurement (measurements links)

https://www.geogebra.org/m/FSqNDNxN

*Pictures are indicatives only.

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