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3 years ago

What formula do you use to find the area of a circle?

2 answers:

8 0

The area of a circle is π (Pi) times the Radius squared:
A = π × r2

Or, when you know the Diameter:

A = (π/4) × D2

Or, when you know the Circumference:

A = C2 / 4π

Hope it helps

CaHeK987 [17]3 years ago

5 0

Its Area = 3.14r^2 or pie multiplied by r or the radius then square the product

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The roots of $3x^2 - 4x + 15 = 0$ are the same as the roots of $x^2 + bx + c = 0,$ for some constants $b$ and $c.$ Find the orde

Akimi4 [234]

we are given

quadratic equation as

$3x^2-4x+15=0$

now, we can find b and c from

$x^2+bx+c=0$

we can see that coefficient of x^2 is 1

so, we will have to make coefficient x^2 as 1

so, we divide both sides by 3

$3x^2-4x+15=0$

$\frac{3x^2-4x+15}{3}= \frac{0}{3}$

$\frac{3x^2}{3}-\frac{4x}{3}+\frac{15}{3}= \frac{0}{3}$

now, we can simplify it

$x^2-\frac{4}{3}x+5= 0$

now, we can compare it with

$x^2+bx+c=0$

we get

$b=-\frac{4}{3}$

$c=5$

so, we get order pair as

$(b,c)=(-\frac{4}{3} , 5)$ ..............Answer

6 0

3 years ago

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The equation P= 21 + 2w models the perimeter, P, of a rectangle with a length of / units and a width of w units.

natima [27]

Answer:

width = 10 units and length = 20 units

Step-by-step explanation:

Let the width be w

so Length will be 2w

using the rectangle formula:

$\sf Perimeter \ of \ rectangle= 2L + 2W$

$\sf 60= 2(2w) + 2w$

$\sf 60= 4w + 2w$

$\sf 60= 6w$

$\sf w = 10 \ units$

Find length:

$\sf length = 2w$

$\sf length = 2(10)$

$\sf length = 20 \ units$

5 0

2 years ago

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5 0

3 years ago

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ZA and ZB are complementary angles. If m_A= (7x + 28)° and m

snow_lady [41]

Answer:

mA=56 degrees

Step-by-step explanation:

Complementary angles adds up to 90 degrees. This imply that

$(7x+28)+(8x+2)=90$

From this equation, we can find x:

$15x+30=90\\15x=90-30\\15x=60\\x=\frac{60}{15}\\x= 4$

Now, we can substitute the value for x into the angle mA:

$mA=(7*4+28)\\mA=(28+28)\\mA=56$

7 0

2 years ago

What is the intersection of the sets A=3, 4, 6 14, 19) and B= (1, 3 6, 8,14)?

zhenek [66]

Answer = (3,6,14)

Intersection of sets simply means to list down the numbers that appear in both sets

8 0

3 years ago

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