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Understanding Elementary Shapes |Speed Notes
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The distance betweenthe end pointsof a line segment is its length. A graduatedruler and the divider are useful to compare lengthsof line segments. When a hand of a clock moves from one position to another position we have an examplefor an angle. (Scroll down to continue …)
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One full turn of the hand is 1 revolution.
A right angle is ¼ revolution and a straight angle is ½ a revolution. We use a protractor to measure the size of an angle in degrees.
The measure of a right angle is 90° and hence that of a straight angle is 180°.
An angle is acute if its measure is smaller than that of a right angle and is obtuseif its measure is greaterthan that of a right angle and less than a straightangle.
A reflex angle is largerthan a straight angle.
Two intersecting lines are perpendicular if the anglebetween them is 90°.
The perpendicular bisector of a line segmentis a perpendicular to the line segmentthat divides it into two equal parts.
Triangles can be classified as follows based on their angles:
![](https://static.wixstatic.com/media/f69947_98a4d87082ef4cff97be1be49207cb8e~mv2.png/v1/fill/w_814,h_219,al_c,lg_1,q_85,enc_auto/f69947_98a4d87082ef4cff97be1be49207cb8e~mv2.png)
Triangles can be classified as follows based on the lengths of their sides:
![](https://static.wixstatic.com/media/f69947_239bec6326d64328a1ad856e9a85228c~mv2.png/v1/fill/w_679,h_403,al_c,lg_1,q_85,enc_auto/f69947_239bec6326d64328a1ad856e9a85228c~mv2.png)
Polygons are namedbased on theirsides.
![](https://static.wixstatic.com/media/f69947_1c1367bf965b47f188531739ce5349cd~mv2.png/v1/fill/w_561,h_300,al_c,lg_1,q_85,enc_auto/f69947_1c1367bf965b47f188531739ce5349cd~mv2.png)
Quadrilaterals are furtherclassified with reference to their properties.
![](https://static.wixstatic.com/media/f69947_9f24ca789ab4486f90869b4d1762f8f3~mv2.png/v1/fill/w_814,h_267,al_c,lg_1,q_85,enc_auto/f69947_9f24ca789ab4486f90869b4d1762f8f3~mv2.png)
·We see aroundus many three dimensional shapes.Cubes, cuboids, spheres,
cylinders, cones,prisms and pyramidsare some of them.
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