| Maudhui | Protractor yenye Kishikio cha Ubadilishaji |
| Pointi za Uuzaji | |
| Vipengele | muundo rahisi, urefu tofauti na pembe mbili za kuchagua |
| Matumizi | Chora mstari wa moja kwa moja na kupima urefu |
| Vigezo | 7cm-0-7cm, 11cm-0-11cm |
| Uthibitisho |
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