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4 Two angles of a triangle are 128° and 26°.

Explain why the triangle must be isoceles

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*Given**,**the** **two** **angles** **are** **1**2**8**°** **and** **2**6**°*

*And** **also** **given** **it's **a** *__tria____ngle__

*we** **know** **that**,** **sum** **of** **3** **sides** **in** **a** **tria**ngle** **=** **1**8**0**°*

*So** **1**2**8** **+** **2**6** **+** **third** **angle** **=** **1**8**0**°*

*1**5**4** **+** **third** **angle** **=** **1**8**0**°*

*third** **angle **=** **1**8**0**°**-**1**5**4**°*

*third** **angle** **=** **2**6**°*

*So** **the** **three** **angles **are** **1**2**8**,**2**6**,**2**6*

*Isosceles** **triangle **-** **Either** **two** **sides** **or** **angles** **of** **a** **triangle** **are** **same*

*Here**,** **2**6** **and** **2**6** **are** **same*

*So** **hence** **it's **a** **isosc**eles** triangle*

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