19. A sector of a circle has radius 6 and arc length 10 , as shown.
What is the area of the sector?

A 30
B 36
C 40
D 60
E 66
19. A The circumference of the circle is $2 \pi \times 6=12 \pi$.
So the area of the sector shown is $\frac{10}{12 \pi} \times \pi \times 6^{2}=\frac{10 \times 36}{12}=30$.