5. The whole surface area of hemisphere is
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ᴛʜᴇ ᴛᴏᴛᴀʟ sᴜʀғᴀᴄᴇ ᴀʀᴇᴀ ᴏғ ᴀ ʜᴇᴍɪsᴘʜᴇʀᴇ = 3πʀ2 sǫᴜᴀʀᴇ ᴜɴɪᴛs
ᴛʜᴇ ᴛᴏᴛᴀʟ sᴜʀғᴀᴄᴇ ᴀʀᴇᴀ ᴏғ ᴀ ʜᴇᴍɪsᴘʜᴇʀᴇ = 3πʀ2 sǫᴜᴀʀᴇ ᴜɴɪᴛsᴡʜᴇʀᴇ π ɪs ᴀ ᴄᴏɴsᴛᴀɴᴛ ᴡʜᴏsᴇ ᴠᴀʟᴜᴇ ɪs ᴇǫᴜᴀʟ ᴛᴏ 3.14 ᴀᴘᴘʀᴏxɪᴍᴀᴛᴇʟʏ. “ʀ” ɪs ᴛʜᴇ ʀᴀᴅɪᴜs ᴏғ ᴛʜᴇ ʜᴇᴍɪsᴘʜᴇʀᴇ.
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