A cow is grazing in a pasture bordered by two fences more than ten feet long that meet at an angle of 60 . If the cow is tethered by a ten foot rope to the post where the fences meet, it can graze an area of:

• A. 20p sq. feet
• B.
• C. <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>50 </center></td><td rowspan="2">sq. feet</td></tr><tr><td style="text-align: center;">3</td></tr></table>
• D. <table><tr><td style="border-bottom:1px solid #000000;vertical-align:bottom;padding-bottom:2px;"><center>5 </center></td><td rowspan="2">sq. feet</td></tr><tr><td style="text-align: center;">3</td></tr></table>
• E. None of these