Qualification > Math

maths c2 edexcel

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halosh92:
the vertices of a quadrilateral ABCD has coordinates A(-1,5)     B(7,1)       C(5,-3)           D(-3,1)
show that the quadrileteral is a triangle

astarmathsandphysics:
You mean a parallelogram. In morning

halosh92:

--- Quote from: astarmathsandphysics on March 19, 2010, 10:40:14 pm ---You mean a parallelogram. In morning

--- End quote ---

sorry i meant rectangle not paralleolgram
 :P

astarmathsandphysics:
A(-1,5)     B(7,1)       C(5,-3)           D(-3,1)
AB=(7,1)-(-1,5)=(8,-4)
C-D=(5,-3)-(-3,1)=(8,-4)=B-A so Ab is same length as CD
CB=(7,1)-(5,-3)=(2,4)=DA
Also AB.CB=8*2+-4*4=0 etc

halosh92:
find the coordinates of the point where the tangent to the curve y=x^2 + 1  at the point (2,5)
meets the normal to the same curve at the point (1,2)

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