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As level Pure mathematics Question

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xxemoxx:
Show that the triangle formed by the points (-2,5) , (1,3) , (5,9) is right angled..

Please help
thanks its urgent

astarmathsandphysics:

--- Quote from: xxemoxx on August 28, 2009, 06:29:25 pm ---Show that the triangle formed by the points (-2,5) , (1,3) , (5,9) is right angled..

Please help
thanks its urgent

--- End quote ---

Call the points A,B,C then AB=B-A=(3,-2) and AC=C-A=(7,4) and BC=C-B=(4,6)

dot product AB with BC=3*4+-2*6=0 there AB is at right angles to BC with a right angle at B
=

xxemoxx:
thankyou! I slved that Q sometime back
can u help me with this one..
A(7,2) C(1,4) are two vertices of a square ABCD
(a)find the equation of the diagonol BD
(b) Find the coordinates of B and of D

astarmathsandphysics:
thanks

spiderman:
sin(2@+60)=0.3584
find the least 2 +ve values of @...



Pls someone help me.......in solving d sum

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