Posted by **Jake** on Thursday, March 22, 2012 at 3:15pm.

Rectangle side is represented by (2,3) and (-6,4). Find the perimeter of rectangle.

Could someone please help~

- Calculus -
**Bosnian**, Thursday, March 22, 2012 at 4:21pm
x1 = 2

x2 = -6

y1 = 3

y2 = 4

Length of first side :

a = x1 - x2

a = 2 - ( - 6 )

a = 2 + 6 = 8

Length of second side :

b = | ( y1 - y2 ) |

b = | 3 - 4 |

b = | - 1 |

b = 1

P = 2 ( a + b )

P = 2 ( 8 + 1 )

P = 2 * 9 = 18

Remark :

| |

mean absolute value

- Calculus -
**Jake**, Thursday, March 22, 2012 at 4:32pm
Thank you for answering.

Don't I have to find the magnitude then use square root of the answer and multiply by 2? If so, could you show it.

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