MCQ
The points $A(-4,-1), \,B (-2,-4),\, C(4,0)$ and $D(2,3)$ are the vertices of
- AParallelogram
- ✓Rectangle
- CRhombus
- DNone of these
Also ${S_{AB}} = \frac{{ - 4 + 1}}{{ - 2 + 4}} = \frac{{ - 3}}{2},\,\,\,{S_{AD}} = \frac{{3 + 1}}{{2 + 4}} = \frac{2}{3}$
${S_{AB}}\,.\,{S_{AD}} = - 1.$ Hence it is a rectangle.
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$(I)$ If $\alpha \in(-1,0)$, then $\mathrm{b}$ cannot be the geometric mean of $\mathrm{a}$ and $\mathrm{c}$
$(II)$ If $\alpha \in(0,1)$, then $\mathrm{b}$ may be the geometric mean of $a$ and $c$