[ad_1]
Topic
In the coordinate plane Oxygenfor triangle ABC yes A(− 1 ; − 5), REMOVE(5 ; 2) and weight
center is the origin. Point coordinates OLD to be:
A. (4 ; -3) B. (-4 ; -3) C. (-4 ; 3) D. (4 ; 3)
Solution method – See details
Apply the result: If WOOD(a; b) is the centroid ofABC with \(A({x_A};{y_A}),B({x_B};{y_B}),C({x_C};{y_C})\) then \(\left\{ \begin{array}{ l}a = \frac{{{x_A} + {x_B} + {x_C}}}{3}\\b = \frac{{{y_A} + {y_B} + {y_C}}}{3}\end {array} \right.\) to find point coordinates OLD
Detailed explanation
According to the assumption, O is the focusABC so \(\left\{ \begin{array}{l}\frac{{ – 1 + 5 + {x_C}}}{3} = 0\\\frac{{ – 5 + 2 + {y_C}}} {3} = 0\end{array} \right.\)\( \Rightarrow \left\{ \begin{array}{l}{x_C} = – 4\\{y_C} = 3\end{array} \ right.\)
Select Size
[ad_2]
Source link net do edu
