Question

Please help me, you will get 50 points. i did 1 and 3-10 but idk what 2 is

Answer 1

$= = > \: diameter \: of \: circle = 1.6 \: inches \\ \\ = > so \: radius \: of \: circle \: = \frac{1.6}{2} \\ \\ = > formula \: of \: area \: of \: circle = \pi {r}^{2} \: \: \: \: \: \: \: \: \: \: \: \: \boxed{\bf{ \pi = \frac{22}{7} }}\\ \\ = > \frac{22}{7} \times \frac{1.6}{ 2} \times \frac{1.6}{2} \\ \\ = > 3.14 \times 0.8 \times 0.8 \\ \\ = > 0.64 \times 3.14 \\ \\ = > 2 {cm}^{2} \bf{ ( approx)} \\ \\ \large\red{\boxed{\bf{additional \: information}}} \\ \\ \bf{area \: of \: circle = \pi{r}^{2}} \\ \\ \bf{circumference \: of \: circle =2 \pi r}$