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$0$ O Which of these best describe $\pi ^{7}$ F The square root of the area of a circle $\tarc{G} $ The ratio of the radius of a circle to its diameter H The radius of a circle times $3.14$ $3$ J The ratio of the circumference of a circle to its diameter

$3.$ In Young's double slit interference experiment, the $s|i$ separation is made $3$ fold. The fringe width becomes $S$ $\left(a\right)$ $1/3$ times $\left(b\right)$ $119$ times $\left(c\right)$ $3$ times $\left(d\right)$ $9$ times $\left($ (a) $\right)$ $\left($ (b) $\right)\right)$ $\left(c\right)$ $\left(d\right)$

$6\right)$ Given: $∠1=\left(18+9x\right)^{°}and∠2=\left(6x-15\right)^{°}$ Determine h e valu e o fal he mis ing angles $2$ $3$ $1$ $4$ $6$ $5$

$ASSccndng$ ordes $\dfrac {9} {5},\dfrac {1} {3}$ $\dfrac {3} {10}$

$4\dfrac {2} {7}$ times $z35$