An exterior of triangle is
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ᴀɴ ᴇxᴛᴇʀɪᴏʀ ᴏғ ᴛʀɪᴀɴɢʟᴇ ɪs ᴇǫᴜᴀʟ ᴛᴏ sᴜᴍ ᴏғ ɪᴛ's ᴛᴡᴏ ᴏᴘᴘᴏsɪᴛᴇ ɪɴᴛᴇʀɪᴏʀ ᴀɴɢʟᴇ
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exterior angle = sum of opposite interior angle
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