## anonymous one year ago help please

1. anonymous

2. anonymous

thank you so much

3. anonymous

4. anonymous

i really need to finish my online class for the summer by 2morrow and i only have 17 questions left

5. UnkleRhaukus

for the first one, the sector is half a circle

6. UnkleRhaukus

do you remember the area of a circle?

7. UnkleRhaukus

@senpai_yerm

8. anonymous

oh srry no

9. UnkleRhaukus

The area of a full circle, (or radius $$r$$ and diameter $$d$$) is $A_\text{circle}=\pi r^2 = \pi\left(\frac d2\right)^2$

10. UnkleRhaukus

Our sector is not a full circle (360°), but only 180° $A_\text{sector}=\frac{180°}{360°}A_\text{circle }\\ \qquad=\frac12A_\text{circle}\\ \qquad=\tfrac12\pi r^2\\ \qquad=\tfrac12\pi\left(\frac d2\right)^2$

11. anonymous

what do u think inkyvoyd