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3 years ago

If the diameter of a circle is 20 cm, what is the area?

Mathematics

2 answers:

EastWind [94]3 years ago

5 0

Answer:

Half of 20 is 10(New radius)

10^2(radius squared) = 100

100pi is your next step, which is 100π cm2

Formula area of a circle:

πr^2

pi(3.14 or 22/7 depending on what they tell you to use for pi) x radius(half of your diameter or given radius) squared(to the power of 2)

Pi x radius being squared

katovenus [111]3 years ago

3 0

Answer:

A = 100 pi cm^2

Step-by-step explanation:

A = pi(r^2)

A = pi(10^2)

A = pi(100)

A = 314.16 '

Convert to pi units.

314.16 ---> 100pi cm^2

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Use a graphing calculator to solve the system of linear equations. 2.1x+4.2y=14.7 −5.7x−1.9y=−11.4

tia_tia [17]

I used my calculator and got x=1 y=3

solve for y to put them in your calculator

2.1x+4.2y=14.7

y = (14.7 -2.1x)/4.2

−5.7x−1.9y=−11.4

y=(-11.4 +5.7x)/(-1.9)

then using the ploting tool I plotted them and found where they intersected

3 0

3 years ago

Please assist, thank you.

ale4655 [162]

Answer:

392 ft²

Step-by-step explanation:

Break this area into two parts, that is, into two trapezoids. The first trapezoid, on the left, has length 8 ft and average length (30 ft + 27 ft)/2, so its area is (8 ft)(28.5 ft) = 228 ft ².

The second trapezoid has width 8 ft and average length (19 + 22)/2 ft, or 8 ft by 20.5 ft). The area of this part is 164 ft².

Thus, the total area is 164 ft² + 228 ft², or 392 ft²

8 0

3 years ago

Which equation shows the relationship in the table below X 3, 5, 8, 11 Y 7 ,11, 17, 23 a y=2xb y=x+4 c y=2x+1 d y=2x+4

ladessa [460]

ANSWER

$c)\text{ }y=2x+1$

EXPLANATION

We want to find the equation for the relationship shown in the table.

The relationship shown in the table represents a linear relationship. The general form of a linear equation is:

$y=mx+b$

where m = slope

b = y-intercept

To find the slope of the equation, apply the formula:

$m=\frac{y_2-y_1}{x_2-x_1}$

where (x1, y1) and (x2, y2) are two sets of values from the table.

Let us take (3, 7) and (5, 11) as (x1, y1) and (x2, y2)

Hence, the slope of the equation is:

$\begin{gathered} m=\frac{11-7}{5-3}=\frac{4}{2} \\ m=2 \end{gathered}$

Now, to find the equation of the line, apply the point-slope method:

$y-y_1=m(x-x_1)$

Therefore, the equation that shows the relationship in the table is:

$\begin{gathered} y-7=2(x-3) \\ y-7=2x-6 \\ y=2x-6+7 \\ y=2x+1 \end{gathered}$

The correct option is option C.

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1 year ago

Can y'all help me with this problem 9-3 divided 1/3+1

o-na [289]

Answer:

Step-by-step explanation:

9-3 ÷ 1/3 + 1

= 9-3×3+1

=9-9+1

= 1

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olganol [36]

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2 years ago

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