8th Maths : Chapter 2 : Measurements : 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.

*If browser
requires, allow Flash Player or Java Script to load the page

Tags : Measurements | Chapter 2 | 8th Maths , 8th Maths : Chapter 2 : Measurements

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8th Maths : Chapter 2 : Measurements : Summary | Measurements | Chapter 2 | 8th Maths

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