9514 1404 393
Answer:
- volume: 100π cm³ ≈ 314.2 cm³
- area: 65π cm² ≈ 204.2 cm²
Step-by-step explanation:
The other leg of the right triangle is found from the Pythagorean theorem:
r² + 12² = 13²
r = √(169 -144) = √25 = 5
The solid of revolution is a cone with a radius of 5, a height of 12, and a slant height of 13.
The volume is given by ...
V = (1/3)πr²h
V = (1/3)π(5 cm)²(12 cm) = 100π cm³ . . . volume
__
The lateral surface area is given by ...
LA = πrh . . . where h is the slant height
LA = π(5 cm)(13 cm) = 65π cm² . . . curved surface area
Answer:
The speed of the boat in still water u = 8 
Step-by-step explanation:
Let speed of the boat = u
Speed of the current = v = 4
Given that the first boat to travel 3 miles upstream and back in a total 1 hour.
So
Since v = 4
By solving above equation
u = 8 , - 2
Since u = -2 is not valid.
⇒ u = 8
This is the speed of the boat in still water.
Answer:
I'm sorry I just need points
Step-by-step explanation:
Answer:
100 degrees
Step-by-step explanation:
α=2θ
α=2(50)
α=100
