Answer:
.81
Step-by-step explanation:
Look at the picture for your answer
area of Arc subtending (i.e. the whole circle) is $\pi r^2$
so area of Arc subtending $\theta^{\circ}$ is, $\frac{ \pi r^2}{360^{\circ}}\times \theta^{\circ}$
$\theta =72^{\circ}$ so the area enclosed by one such arc is $\frac{\pi (10)^272}{360}$
abd there are 2 such arcs, so double the area.
Ebony kept her bank account open for only 3 weeks, and the graph shows the entire 3 weeks. During that time,her greatest balance was $400