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2 years ago

Find the area of the circle. Round your answer to two decimal places, if necessary.

Mathematics

1 answer:

jekas [21]2 years ago

3 0

Answer:

A≈50.27

Step-by-step explanation:

The formula for an Area of a circle is: A=πr(squared)

As was can the the diametter is 4, and the radius is half of the diameter, making the radius half of 4 whitch is 2. now just plug in two for R.

A= π4(squared)

4(squared) = 16

A= 16π

A= 50.27

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Find the length of AB. A. 2 B. 6 C. 21 D. 31

Allushta [10]

Answer

AB=21

Solution

In the triangle ABC two lines are parallel to side AC.In a triangle a line passing through two side and it is parallel to third side,then this line divides two side in equal ratio.

Here we take any of the parallel line, passing through AB and AC, and parallel to BC.

So we can write, $\\$ $\frac{ 6x+2x+1}{2x}$ = $\frac{18+7.5}{6}$

8x+1=6x+2.5x

x=1/0.5

x=2

Therefore AB = 6x+2x+1+2x =10x+1=21

4 0

3 years ago

Let f be the function that determines the area of a circle (in square cm) given the radius of the circle in cm, r. That is, f(r)

yarga [219]

Answer:

The answers to each question are:

a) $A=f(r=4cm)=50.26cm^2$

b) $\Delta A(10.91cm-10.9cm)=f(10.91cm)-f(10.9cm)=0.6851cm^2$

c) $C=5\cdot f(r=12.7cm)=2533.54cm^2$

d) $D=f(r=28cm)+59cm^2=2522.01cm^2$

Step-by-step explanation:

The function f(r) that represents the area of a circle (in square cm) is:

$f(r)=\pi r^2$

a) To represent the area (in square cm) of a circle whose radius is 4 cm, you just have to evaluate the function with a radius of 4cm:

$A=f(r=4cm)=50.26cm^2$

b) To represent how much the area (in square cm) of a circle increases by when its radius increases from 10.9 to 10.91 cm, you have to represent the difference between the final area with a radius of 10.91cm and the initial area of a radius of 10.9cm:

$\Delta A(10.91cm-10.9cm)=f(10.91cm)-f(10.9cm)=0.6851cm^2$

c) To represent the area of 5 circles that all have a radius of 12.7 cm, we can use the function f(r) to represent the area of a circle with a radius of 12.7cm and multiply it for 5:

$C=5\cdot f(r=12.7cm)=2533.54cm^2$

d) To represent the area of the larger circle that is 59 square cm more than the first circle (with a radius of 28 cm), we can use the function f(r) to obtain the area of the first circle and addition 59 square cm:

$D=f(r=28cm)+59cm^2=2522.01cm^2$

6 0

3 years ago

Is 2/5 a rational number?

lys-0071 [83]

Answer:

the rational numbers is 2

6 0

3 years ago

Read 2 more answers

A photo of a beetle in a science book is increased to 705% as large as the actual size. If the beetle is 14 millimeters, what

uranmaximum [27]

Answer:

11.27cm

Step-by-step explanation:

705% of 14milimeters

705/100 X 14 = 98.7

increase by adding 98.7milimeter to 14milimeter

98.7+14= 112.7milimeter or 11.27cm

3 0

3 years ago

g A two-tailed test is one where: Select one: a. results in only one direction can lead to rejection of the null hypothesis b. n

e-lub [12.9K]

Answer:

c. results in either of two directions can lead to rejection of the null hypothesis.

Step-by-step explanation:

A two tailed test is performed when we want to test if there is statistically significant difference from the null state. That means that if the statistic value is significantly higher or significantly lower, we will reject the null hypothesis. Both tails have rejection areas.

8 0

3 years ago