All categories

2 years ago

The diameter of a circle is 18 cm. What is its area in terms of π.

Mathematics

2 answers:

galina1969 [7]2 years ago

3 0

The area of the circle would be 81π.

yarga [219]2 years ago

3 0

Answer:

Area, $A=(81\pi )\ cm^2$

Step-by-step explanation:

Given that,

The diameter of the circle, d = 18 cm

The radius of a circle is half of its diameter, r = 9 cm

The formula to find the area of a circle is given by :

$A=\pi r^2$

When r = 9 cm

$A=\pi (9\ cm)^2$

$A=(81\pi )\ cm^2$

So, the area of the circle is $(81\pi )\ cm^2$ . Hence, this is the required solution.

You might be interested in

33° (3m + 3) ent OR Vertical_ Angle Relationship: Complementary OR Supplementary

Reptile [31]

Answer:

complementary

Step-by-step explanation:

because the angles add up to 90°

3 0

2 years ago

What's 675890 in word form

Artist 52 [7]

675890 is spelled six hundred and seventy-five thousand, eight hundred and ninety

8 0

2 years ago

Read 2 more answers

1. How can you find the decimal forms of 3/12 and 2/9?

Helga [31]

Answer:

1. 0.472

2. 0.25

Step-by-step explanation:

1. reduce the fraction with 3 = 1\4 + 2\9

write all numerators above the Least common denominator 36 =9 + 8\36

Add numbers = 17\36 and the alternate form is 0.472

2. Divide the numerator and denominator by three = 3 ÷ 3\12 ÷ 3 = 0.25

I can't do the others now I have an exam(sorry)

6 0

2 years ago

this is the rust of the questions please please some one helps me because I really try my best to solve it . thank you

lyudmila [28]

Answer:

x = 24.

r $\ne$ 0.

Step-by-step explanation:

2. The given equation is:

$\frac{1}{2} (x - 4) = \frac{1}{3} x + 2$

a) To eliminate the fractions multiply the equation throughout by the LCM of the denominators of the fraction. In this case, the LCM of (2, 3). The LCM is 6. So, multiply the entire equation by 6.

b) Half of the difference between an integer and 4 equals the sum of one - third of the integer and 2. Find the integer.

c) We have the equation:

$\frac{1}{2} (x - 4) = \frac{1}{3} x + 2$

Multiplying throughout by 6, we get:

$\frac{6}{2}(x - 4) = \frac{6}{3} x + 6(2)$

$\implies 3(x - 4) = 2x + 12$

$\implies 3x - 12 = 2x + 12$

$\implies x = 24$

Therefore, the solution of the equation is 24.

3. The given equation is: $ry + s = tx - m$

To solve for y:

We can rearrange the equation as:

$ry = tx - m - s$

$\implies y = \frac{tx - m - s}{r}$

or, $y = \frac{tx - (m + s)}{r}$

Note that we have to impose a condition on variable $r$ . It would be that $r$ can never be zero. i.e., $r \ne 0$ . Otherwise, the value of $y$ would be undefined.