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3 years ago

Explain why you can use πr2 to find the area of the base of a cone

1 answer:

8 0

The base of a cone is a circle.

The area of a circle is $\pi r^2$ .

Thus, the area of the base of a cone $\pi r^2$ .

The derivation of the formula for the area of a circle involves a bit of calculus, but if you'd like, I can walk you through it.

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Simora [160]

Answer:

try c

Step-by-step explanation:

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3 years ago

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I NEED HELP PLS I WILL MARK BRAINLIEST

ANEK [815]

Answer:

$\approx 11.2\:\mathrm{in}$

Step-by-step explanation:

The swing of the tip of pendulum is creating an arc. The question is actually asking for the length of this arc. The length of an arc is given by $2r\pi\cdot \frac{\theta}{360}$ , where $r$ is the radius of the circle and $\theta$ is the angle of the arc.

In this problem, we're given:

$\theta = 40^{\circ},\\r=16$

Substituting given values, we get:

$2\cdot 16\cdot \pi \cdot \frac{40}{360}=32\pi\cdot \frac{1}{9}\approx \boxed{11.2\:\mathrm{in}}$

8 0

3 years ago

Jesus deposited $2000 into a new savings account that paid interest at an annual rate of 3% compounded continuously. If there we

Mila [183]

Answer: $2394.43

explanation: use equation A=Pe^rt. A=2000e^(0.03x6). A=2394.43

3 0

3 years ago

A large nest of recently hatched bald eagles is located at the top of the Eiffel Tower (which is 324 meters tall) and is attract

Mariulka [41]

9514 1404 393

Answer:

80.5°

Step-by-step explanation:

The applicable trig function is the tangent.

Tan = Opposite/Adjacent

In this scenario, the side opposite the angle is the tower height, 324 m. The side adjacent is the distance to the tower, 54 m. Then the angle α is related by ...

tan(α) = 324/54

The value of the angle with this tangent is found using the arctangent function:

α = arctan(324/54) ≈ 80.5°

She should set her binoculars to 80.5°.

6 0

2 years ago

Which transformations can be used to carry ABCD onto itself? Check all that apply<br>PLEASE HELP

eduard

Answer:

A and B

Step-by-step explanation:

Reflection and rotation

3 0

3 years ago

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