38: it's a right triangle
39:
area:
![a = \pi {r}^{2}](https://tex.z-dn.net/?f=a%20%3D%20%5Cpi%20%7Br%7D%5E%7B2%7D%20)
![a = 3.14 \times {10}^{2} = 314](https://tex.z-dn.net/?f=a%20%3D%203.14%20%5Ctimes%20%7B10%7D%5E%7B2%7D%20%3D%20314)
circumference:
![c = \pi \times diameter](https://tex.z-dn.net/?f=c%20%3D%20%5Cpi%20%5Ctimes%20diameter)
Answer:
1,286.1 units is the answer
Step-by-step explanation:
your answer may vary depending on what you use for pie, using a calculator with pie on it gave me approx. 1286.79635
volume formula: V=πr^2h
so π*6.4^2*h
π*40.96*10
3.14*409.6
1,286.144
round
1,286.1
Answer:
angle BED and angle DEB are the answers.