The lateral surface of regular terhad
regular tetrahedron in en om is
b) 900 /
130/
a 100/
a
b
C С
d
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ᴡʜᴀᴛ ᴄᴀɴ ʏᴏᴜ sᴀʏ ᴀʙᴏᴜᴛ ᴛʜᴇ ᴍᴏᴛɪᴏɴ ᴏғ ᴀɴ ᴏʙᴊᴇᴄᴛ ɪғ ɪᴛs sᴘᴇᴇᴅ-ᴛɪᴍᴇ ɢʀᴀᴘʜ ɪs ᴀ sᴛʀᴀɪɢʜᴛ ʟɪɴᴇ ᴘᴀʀᴀʟʟᴇʟ ᴛᴏ ᴛʜᴇ ᴛɪᴍᴇ ᴀxɪs? ᴀɴsᴡᴇʀ: sᴘᴇᴇᴅ-ᴛɪᴍᴇ ɢʀᴀᴘʜ ɪs ᴀ sᴛʀᴀɪɢʜᴛ ʟɪɴᴇ ᴘᴀʀᴀʟʟᴇʟ ᴛᴏ ᴛɪᴍᴇ ᴀxɪs, ɪᴛ ᴍᴇᴀɴs ᴛʜᴀᴛ ᴛʜᴇ sᴘᴇᴇᴅ ᴏғ ᴛʜᴇ ᴏʙᴊᴇᴄᴛ ɪs ɴᴏᴛ ᴄʜᴀɴɢɪɴɢ ᴡɪᴛʜ ᴛɪᴍᴇ ɪ.ᴇ., ᴛʜᴇ ᴏʙᴊᴇᴄᴛ ɪs ᴘᴇʀғᴏʀᴍɪɴɢ ᴜɴɪғᴏʀᴍ ᴍᴏᴛɪᴏɴ.
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A regular tetrahedron comprises four faces, each of which is an equilateral triangle. If the sum of the lengths of its edges is 120, what is its surface area?
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