2005 PMWC Problems/Problem T7
Problem
Skipper’s doghouse has a regular hexagonal base that measures one metre on each side. Skipper is tethered to a 2-metre rope which is fixed to a vertex. What is the area of the region outside the doghouse that Skipper can reach? Calculate an approximate answer by using or .
Solution
The big sector has a radius of 2 and is 2/3 of the total circle that it used to be a part of, and thus has an area of . The two little sectors each have radius 1 and are 1/6 the total area of their circle, so the area of each of those is . Adding, we get . Then approximate.
See also
2005 PMWC (Problems) | ||
Preceded by Problem T6 |
Followed by Problem T8 | |
I: 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 T: 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 |