Identifying and Classifying 2-D Shapes

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1 Ientifying n Clssifying -D Shpes Wht is your sign? The shpe n olour of trffi signs let motorists know importnt informtion suh s: when to stop onstrution res. Some si shpes use in trffi signs re illustrte elow. Cirle Squre Retngle Otgon Tringle Knowlege n Employility Stuio Mthemtis Shpe n Spe: Ojets n Shpes: Alert Eution, Alert, Cn ( Ientifying n Clssifying -D Shpes /6

2 The tle shows how mny sies eh shpe hs. Shpe Numer of sies Cirle Tringle Retngle Squre Shpes tht hve more thn one sie re lle polygons. A stop sign is n 8-sie polygon lle n otgon n yiel sign is -sie polygon lle tringle. Qurilterls Retngles n squres hve four sies n re prt of lrger group of four-sie shpes lle qurilterls. The ngles of qurilterls totl 60. A qurilterl is ny four-sie figure. quri four lterl sie There re mny types of qurilterls, n they re lssifie oring to their shpes, ngles n lengths of sies, s shown elow. squre retngle prllelogrm rhomus trpezoi Know lege n Employility Stuio Mthemtis Shpe n Spe: Ojets n Shpes: Alert Eution, Alert, Cn ( Ientifying n Clssifying -D Shpes /6

3 Shpe Squre Retngle Prllelogrm Rhomus Trpezoi Chrteristis All sies equl in length All ngles 90 Prllel sies equl in length, ut not the sme length s the other prllel sies All ngles 90 Two prllel sies re equl in length, ut other two prllel sies re ifferent length Two ifferent sets of ngle mesurements All sies equl in length Two ifferent sets of ngle mesurements Lengths of sies my not e equl Opposite sies re not prllel Angles vry n my iffer from eh other Tringles There re three types of tringles. Tringles re lssifie oring to the length of their sies n the mesurement of their lrgest ngle. The ngles of tringles totl 80.. Length of sies Isoseles Tringle Equilterl Tringle Slene Tringle Two sies re equl in length. line of symmetry All sies re equl in length. lines of symmetry All sies re ifferent in length. 0 lines of symmetry Mesurement of the lrgest ngle Right Tringle Aute Tringle Otuse Tringle Lrgest ngle is extly 90 Lrgest ngle is <90 Lrgest ngle is >90 Knowlege n Employility Stuio Mthemtis Shpe n Spe: Ojets n Shpes: Alert Eution, Alert, Cn ( Ientifying n Clssifying -D Shpes /6

4 Think Aout Humn-me strutures suh s uilings n riges re reting using shpes suh s irles, retngles n squres. Shpes re lso foun in nture, for exmple, the sun is irle n the entre of flower is irle. Wht other shpes re foun in nture? Prtie: Mesuring n Clssifying Qurilterls. Use ruler n protrtor to mesure n reor the lengths of eh sie n ngle. Then lssify eh qurilterl. Shpe Length of eh sie Angles.. ) ) ). ) ). ) Knowlege n Employility Stuio Mthemtis Shpe n Spe: Ojets n Shpes: Alert Eution, Alert, Cn ( Ientifying n Clssifying -D Shpes /6

5 Mesure n Clssify Qurilterls (ontinue) Shpe Length of eh sie Angles.. ) ) ). ) ). ).. ) ) ) With prtner, lote vriety of lrge n smll qurilterls in your lssroom or shool, suh s oors, winows, tles n tiles. Use pproprite instruments to mesure ngles n sies (in metri n/or imperil units). Knowlege n Employility Stuio Mthemtis Shpe n Spe: Ojets n Shpes: Alert Eution, Alert, Cn ( Ientifying n Clssifying -D Shpes 5/6

6 Prtie: Mesuring n Clssifying Tringles. For eh tringle, mesure the lengths of eh sie n ngle using ruler n protrtor. Clssify eh tringle oring to the length of sies n ngles. Shpe Length of eh sie Angles. ) ). ) ). ) ) Mny is esigning tringulr errings. She mkes eh sie of the tringles ifferent length. Two of the sies join together to form n ngle of. Clssify, in two wys, the types of tringles Mny esigne. Knowlege n Employility Stuio Mthemtis Shpe n Spe: Ojets n Shpes: Alert Eution, Alert, Cn ( Ientifying n Clssifying -D Shpes 6/6

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