13. a) In an orthogonal system of origin O and axes x'Ox and y'Oy locate the points :
M(0;2), N(2;0), P(0;-2) and Q(-2;0)..
b) Determine the nature of the triangle OMN
and justify your answer . Deduce the
measures of the angles of this triangle
c) Same question for the triangle MOQ,
d) Determine the nature of MNPO and find
its area
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