Coordinate geometry help? - XP Math - Forums

 XP Math - Forums Coordinate geometry help?

 08-04-2007 #1 Stormy Knight Guest   Posts: n/a Coordinate geometry help? Consider a quadrilateral ABCD in which A is (0,10). B is (2,16) and C is (8,14).(i) Show that triangle ABC is isoscelesThe point D lies on the x-axis and is such that AD=CDFind(ii) Coordinates of D(iii) Ratio of area of triangle ABC to the area of triangle ACD
 08-04-2007 #2 jonathantam1988 Guest   Posts: n/a i) you can show that 3 sides are equal.Do this for 3 times:AB=B-A=(2,6)length of AB=sqrt(4+36)=2sqrt(10)the length of BC and CA should also be 2sqrt(10)ii)AD=ACthe coordinate of D will be (0,x)use two length equation and equal them....then you can get xiii) simple division

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is Off Forum Rules
 Forum Jump User Control Panel Private Messages Subscriptions Who's Online Search Forums Forums Home Welcome     XP Math News     Off-Topic Discussion Mathematics     XP Math Games Worksheets     Homework Help     Problems Library     Math Challenges

All times are GMT -4. The time now is 02:13 PM.

 Contact Us - XP Math - Forums - Archive - Privacy Statement - Top