1.

State the angle sum property of triangle..............​

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ᴛʜᴇᴏʀᴇᴍ : ᴀɴɢʟᴇ sᴜᴍ ᴘʀᴏᴘᴇʀᴛʏ ᴏғ ᴛʀɪᴀɴɢʟᴇ sᴛᴀᴛᴇs ᴛʜᴀᴛ ᴛʜᴇ sᴜᴍ ᴏғ ɪɴᴛᴇʀɪᴏʀ ᴀɴɢʟᴇs ᴏғ ᴀ ᴛʀɪᴀɴɢʟᴇ ɪs °. ᴘʀᴏᴏғ: ᴄᴏɴsɪᴅᴇʀ ᴀ ∆ᴀʙᴄ, ᴀs sʜᴏᴡɴ ɪɴ ᴛʜᴇ ғɪɢᴜʀᴇ ʙᴇʟᴏᴡ. ... ᴛʜᴜs, ᴛʜᴇ sᴜᴍ ᴏғ ᴛʜᴇ ɪɴᴛᴇʀɪᴏʀ ᴀɴɢʟᴇs ᴏғ ᴀ ᴛʀɪᴀɴɢʟᴇ ɪs °.



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