Question

i need them all answered except for 17 and 18

Answer 1

Area of circle
\[A=\pi R^{2}\]
Area of sector of a circle
\[a=\frac{ 1 }{ 2 }\pi R^{2}\]
Circumference of a circle
\[=2 \pi R\]
Length of arc of a circle
\[=R \theta \]

Answer 2

what is θ and what does it mean and does it have any numerical value?

Answer 3

\[\theta \] is the angle PRQ

Answer 4

Angle subtended by the arc PQ