All categories

2 years ago

Solve for A if ñ=3.14 and r=3.

Mathematics

1 answer:

julsineya [31]2 years ago

6 0

Answer:

28.26

Step-by-step explanation:

The question gives the first three digits of π, which is 3.14, and it gives us the radius, which is 3. So, just substitute them into the formula and you’ll get 3.14(3^2). Solve it and the final answer is 28.26.

Hope this helps! :)

You might be interested in

Calculate the unknown sides and angles of the triangle ABC given.

creativ13 [48]

<h3>Answer:</h3><h3>See below</h3>

Step-by-step explanation:

<h3>to understand this</h3><h3>you need to know about:</h3>

law of sine
law of cosine
PEMDAS

<h3>let's solve:</h3>

there are 3 ways to solve SAS triangle

use The Law of Cosines to calculate the unknown side,
then use The Law of Sines to find the smaller of the other two angles
and then use the three angles add to 180° to find the last angle.

first figure out $\angle C$

to do so we will use the formula of law of cosine of C angle

${c}^{2} = {a}^{2} + {b}^{2} - 2ab.\cos(C)$

substitute the given values of a,b and $\angle C$

$\sf{c}^{2} = {6 }^{2} + {3.5}^{2} - 2.6.(3.5). \cos( {25.7}^{ \circ} )$

simplify squares:

$c^{2}=36+12.25-42.\cos(25.7^{\circ})$

simplify addition:

$c^{2}=48.25-42.\cos(25.7^{\circ})$

square root both sides

$\sf \: \sqrt{ {c}^{2} } = \sqrt{ 48.25-42. \cos(25.7^{\circ})}$

simplify:

therefore

$\bold{c=3.23}$

use law of sine to figure out angle A

$\dfrac{6}{\sin( \angle \: A) } = \dfrac{3.23}{\sin(25.7)}$

therefore

$\bold{\angle A=53.66°}$ (use calculater to simplify it)

therefore

$\angle B\: is\: 180^{o}-25.70^{o}-53.66^{o}$

$\bold{= 100.64}$

4 0

2 years ago

What is the image of the point (5,-6) after a rotation of 90 counterclockwise about the origin.

WITCHER [35]

Answer:

(-6,5)

Step-by-step explanation:

ignore this part

4 0

2 years ago

If a = 5 and b = 6, evaluate the following expression:<br> 20 - 5a + 3b

aliya0001 [1]

Answer:

20-5 × 5 + 3 × 6

20-25 + 36

Step-by-step explanation:

6 0

2 years ago

14.8 ounces, 15.5 ounces, 14.6 ounces, and 15.4 ounces. Estimate the total weight of the four packages.

Rzqust [24]

60.3 hope that helps

8 0

2 years ago

Read 2 more answers

In a toy factory 200 wooden solid cylinder 7cm long and 35mm in diameter have to be painted. What is the total surface area in c

Semmy [17]

The surface area of a cylinder is:

A=2pr^2+2prh and since r=d/2

A=2p(d^2/4+dh/2)

A=(p/2)(d^2+2dh) and we need 200 of these cylinders...

A=(100p)(d^2+2dh), and using d and h, 3.5cm and 70cm we get:

A=(100p)(3.5^2+2*3.5*7)

A=(100p)(12.25+49)

A=6125p cm^2

A≈19242 cm^2 (to nearest cm^2)

5 0

2 years ago