write the define of right angle
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Wʜᴇɴ ᴛᴡᴏ sᴛʀᴀɪɢʜᴛ ʟɪɴᴇs ɪɴᴛᴇʀsᴇᴄᴛ ᴇᴀᴄʜ ᴏᴛʜᴇʀ ᴀᴛ 90˚ ᴏʀ ᴀʀᴇ ᴘᴇʀᴘᴇɴᴅɪᴄᴜʟᴀʀ ᴛᴏ ᴇᴀᴄʜ ᴏᴛʜᴇʀ ᴀᴛ ᴛʜᴇ ɪɴᴛᴇʀsᴇᴄᴛɪᴏɴ, ᴛʜᴇʏ ғᴏʀᴍ ᴛʜᴇ ʀɪɢʜᴛ ᴀɴɢʟᴇ.
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