I have the problem: Find the distance between two points: (7,1/2pi) and (1,7/2pi). I got the answer 7. However, someone told me this answer is incorrect--that the correct answer is 11. If 11 is the correct answer, how do I get it?
I have the problem: Find the distance between two points: (7,1/2pi) and (1,7/2pi). I got the answer 7. However, someone told me this answer is incorrect--that the correct answer is 11. If 11 is the correct answer, how do I get it?
Hello, Joanie!
Find the distance between two points: $\displaystyle \left(7,\tfrac{\pi}{2}\right)\text{ and }\left(1,\tfrac{7\pi}{2}\right)$
I got the answer 7.
However, someone told me that the correct answer is 11.
Sorry, you're both wrong . . . Did you make a sketch?Code:| o (7, π/2) | | | | | - - - - - + - - - - - - | o (1, 7π/2) | |
Their distance is 8, isn't it?
I am using the formula:
Point 1, Point 2 = Square root of r1^2+r2^2-(2)(r1)(r2)cos(theta2 - theta1)
square root of (7^2+1^2-2(7)(1)cos(1/2pi-7/2pi)
sq. rt. of 50-14cos(-540)
sq.rt of 50-14(.9380)
sq. rt. 50 + 13.132
sq. rt. 63.132
= 7
My possible answers are 11, 7, 8, 10
How can I get the answer 8 using this formula?