1

### IIT-JEE 1987

Fill in the Blanks
A polygon of nine sides, each of length $$2$$, is inscribed in a circle. The radius of the circle is .................

$$\cos ec\,{\raise0.5ex\hbox{\pi } \kern-0.1em/\kern-0.15em \lower0.25ex\hbox{9}}$$
2

### IIT-JEE 1985

Fill in the Blanks
In a triangle $$ABC$$, if cot $$A$$, cot $$B$$, cot $$C$$ are in A.P., then $${a^2},{b^2},{c^2}$$, are in ............... progression.

Arithmetic
3

### IIT-JEE 1985

Fill in the Blanks
The set of all real numbers $$a$$ such that $${a^2} + 2a,2a + 3$$ and $${a^2} + 3a + 8$$ are the sides of a triangle is ...........

$$\left( {5,x} \right)$$
4

### IIT-JEE 1980

Fill in the Blanks
In a $$\Delta ABC,\,\angle A = {90^ \circ }$$ and $$AD$$ is an altitude. Complete the relation $${{BD} \over {BA}} = {{AB} \over {\left( {....} \right)}}$$.

$$B$$ $$C$$

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Class 12