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Question Number 189793 by normans last updated on 21/Mar/23

Commented by mr W last updated on 22/Mar/23

Answered by HeferH last updated on 21/Mar/23

$$180°$$

Answered by HeferH last updated on 22/Mar/23

$$\mathrm{external}\mathrm{angle}1:\mathrm{\angle }\mathrm{A}+\mathrm{\angle }\mathrm{C}$$$$\mathrm{external}\mathrm{angle}2:\mathrm{\angle }\mathrm{B}+\mathrm{\angle }\mathrm{D}$$$$\mathrm{but}\mathrm{they}\mathrm{are}\mathrm{also}\mathrm{internal}\mathrm{for}\mathrm{the}\mathrm{triangle}\mathrm{with}$$$$\mathrm{angle}\mathrm{\angle }\mathrm{E}$$$$\mathrm{now}:\mathrm{\angle }\mathrm{A}+\mathrm{\angle }\mathrm{B}+\mathrm{\angle }\mathrm{C}+\mathrm{\angle }\mathrm{D}+\mathrm{\angle }\mathrm{E}=180°$$

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