Problem Solving

In the xy-plane, the vertices of a triangle have coordinates {0,0},{3,3}, and {7,0}. What is the perimeter of the triangle?

A. 13
B. srt34
C srt43
D 7+6srt2
E 12+3srt2

[spoiler]I got 10srt58, which is not in the ans choice. I got this by noticing it's a right triangle with side a=7, b=3, and then finding side c = srt58. Is this a bad question or am I way off track?[/spoiler]

Thanks...

alex.gellatly wrote:In the xy-plane, the vertices of a triangle have coordinates {0,0},{3,3}, and {7,0}. What is the perimeter of the triangle?

A. 13
B. srt34
C srt43
D 7+6srt2
E 12+3srt2

[spoiler]I got 10srt58, which is not in the ans choice. I got this by noticing it's a right triangle with side a=7, b=3, and then finding side c = srt58. Is this a bad question or am I way off track?[/spoiler]

Thanks...

distance between 0,0 and 3,3 is 3root2
00 and 7,0 is 7
3,3 and 7,0 is 5
so perimeter is 12+3root2