1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Yakvenalex [24]
2 years ago
12

What's the area of a circle with diameter 18 units? Question 8 options: A) 9π units2 B) 81π units2 C) π units2 D) 18π units2

Mathematics
1 answer:
Anna [14]2 years ago
6 0

Answer:

B) 81π units²

General Formulas and Concepts:

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right<u> </u>

<u>Geometry</u>

Radius of a Circle Formula: r = d/2

  • r is radius
  • d is diameter

Area of a Circle Formula: A = πr²

Step-by-step explanation:

<u>Step 1: Define</u>

Diameter <em>d</em> = 18 units

<u>Step 2: Manipulate Variables</u>

Radius <em>r</em> = 18 units/2 = 9 units

<u>Step 3: Find Area</u>

  1. Substitute in <em>r</em> [Area of a Circle Formula]:                                                       A = π(9 units)²
  2. [Area] Evaluate exponents:                                                                              A = π(81 units²)
  3. [Area] Multiply:                                                                                                  A = 81π units²
You might be interested in
Kiran has a toy car collection. He keeps some in a display case and the rest on the wall. 195 of his toy cars are on the wall, a
morpeh [17]

35% are in display cases which means 65% are on the wall.


this means 195 cars is 65% of the collection.


to get total number of cars in the collection divide 195 by 65%

195/0.65 = 300


answer: 300 total cars

4 0
2 years ago
Explain how comparing 645 and 738 is different
DerKrebs [107]
Well both the hundred places are different so u would know that comparing it would be that the 738 is bigger than 645
4 0
3 years ago
Hello please help thanks
daser333 [38]

Answer:

1 and 2 SORRY IF I AM WRONG

8 0
2 years ago
I need help with this question
Bezzdna [24]

Answer:

It is all determined by how many spaces and which way the decimal point moves.

Step-by-step explanation:

So here are two examples

<em>Example 1:</em>

500000.00

To write this in scientific notation you would move the decimal place to the left.

You would move it 5 digits to the left so the exponent of 10 would be 5

5 * 10^{5}

<em>Example 2</em>

0.0000042

Here to write this in scientific notation you move the decimal place to the right.

You would move it 6 digits to the right so the exponent would be -6

4.2 * 10^{-6}

3 0
3 years ago
An Xbox that normally sells for $390 is on sale at a 30% discount. What is the sale price of the Xbox?
schepotkina [342]
$273 as 390×(1-30%)=273
8 0
3 years ago
Other questions:
  • Which number is a factor of 100?<br> O 8<br> o 12<br> O 15<br> O 20
    6·2 answers
  • What is the opposite of the opposite of -3/8
    6·1 answer
  • Can someone please help me with this question?
    9·1 answer
  • The standard normal distribution has a mean of<br><br> and a standard deviation of
    14·1 answer
  • Evaluate 3a2 + 4b2 for a = 2 and b = 3
    6·1 answer
  • Han is planning to ride his bike 24 miles
    8·1 answer
  • 40 minus 36 divided by 6 x 3
    12·1 answer
  • Need help with What is F(x)=a*b^x please explain the steps
    9·1 answer
  • Brenton is a phone specialist who makes 33,00 per year plus an 8$ fee for each sale he makes. if brenton makes 15 sales per week
    13·1 answer
  • Factoring is the opposite of what property?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!