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PQ is tangent to a circle with centre O. If OQ = $a$, OP = $a+2$ and PQ = $2b$, then relation between $a$ and $b$ is
- (a)$a^2 + (a + 2)^2 = (2b)^2$
- (b)$b^2 = a + 4$
- (c)$2a^2+1= b^2$
- (d)$b^2=a+1$
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Sol. (D) $b^2 = a +1$ (1 Mark)