the angles opposite equal sides is an isosceles triangle are
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ᴛʜᴇᴏʀᴇᴍ 1:
ᴀɴɢʟᴇꜱ ᴏᴘᴘᴏꜱɪᴛᴇ ᴛᴏ ᴛʜᴇ ᴇQᴜᴀʟ ꜱɪᴅᴇꜱ ᴏꜰ ᴀɴ ɪꜱᴏꜱᴄᴇʟᴇꜱ ᴛʀɪᴀɴɢʟᴇ ᴀʀᴇ ᴀʟꜱᴏ ᴇQᴜᴀʟ. ᴘʀᴏᴏꜰ: ᴄᴏɴꜱɪᴅᴇʀ ᴀɴ ɪꜱᴏꜱᴄᴇʟᴇꜱ ᴛʀɪᴀɴɢʟᴇ ᴀʙᴄ ᴡʜᴇʀᴇ ᴀᴄ = ʙᴄ. ᴡᴇ ɴᴇᴇᴅ ᴛᴏ ᴘʀᴏᴠᴇ ᴛʜᴀᴛ ᴛʜᴇ ᴀɴɢʟᴇꜱ ᴏᴘᴘᴏꜱɪᴛᴇ ᴛᴏ ᴛʜᴇ ꜱɪᴅᴇꜱ ᴀᴄ ᴀɴᴅ ʙᴄ ᴀʀᴇ ᴇQᴜᴀʟ, ᴛʜᴀᴛ ɪꜱ, ∠ᴄᴀʙ = ∠ᴄʙᴀ.
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