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3 years ago

The radius of a circle is 8 cm. Find its area in terms of pi

Mathematics

2 answers:

andrezito [222]3 years ago

5 0

hey,

A = pi x r²

A = pi x 8²

A = 64pi

Naily [24]3 years ago

3 0

Answer:

The area of the circle in terms of pi is 64π cm²

Step-by-step explanation:

To solve this exercise we need to use the area formula of a circle:

a = area

r = radius = 8cm

π = pi

a = π * r²

a = π * (8cm)²

a = π * 64cm²

a = 64π cm²

The area of the circle in terms of pi is 64π cm²

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Kevin measured a line to be 12.4 inches long. If the actual length of the line is 15.7 inches, then what was the percent error o

Setler79 [48]

Answer:

The percent error of the measurement, to the nearest tenth of a percent is $21.0\%$

Step-by-step explanation:

Estimated length of a line = 12.4 inches

Actual length of the line = 15.7 inches

Error = 15.7 - 12.4 = 3.3 inches

Percent error of the measurement $=\frac{3.3}{15.7}(100)=21.02$ ≈ 21.0

So, the percent error of the measurement, to the nearest tenth of a percent is $21.0\%$

5 0

3 years ago

The longer leg of a right triangle is 1 m longer than the shorter leg. The hypotenuse is 9 m longer than the shorter leg. Find t

Rudiy27

Answer:

Correct answer: c = 29 m, a = 21 m and b = 20 m

Step-by-step explanation:

Given:

a = b + 1 longer leg a

c = b + 9 hypotenuse c

To solve this problem, we will use Pythagoras' theorem

c² = a² + b²

(b + 9)² = (b + 1)² + b²

b² + 18 b + 81 = b² + 2 b + 1 + b²

2 b² - b² + 2 b - 18 b + 1 - 81 = 0

b² - 16 b - 80 = 0 we will factorize this equation

⇒ b² - 20 b + 4 b - 80 = b (b - 20) + 4 ( b - 20) = (b - 20) · (b + 4) = 0

(b - 20) · (b + 4) = 0 ⇒ b = 20 or b = - 4 false

we accepted b = 20 m

c = b + 9 = 20 + 9 = 29 m

c = 29 m

a = b + 1 = 20 + 1 = 21 m

a = 21 m

God is with you!!!

5 0

3 years ago

An SUV uses 12 gallons<br> of gas to drive 264 miles.<br> What is the SUV's miles per gallon rate?

Shkiper50 [21]

Answer: 22 miles per gallon.

Step-by-step explanation: you divide 264 by 12 and you get 22 making it the answer.

7 0

3 years ago

Read 2 more answers

Help with Math PLZ (Questions in screenshot)

-Dominant- [34]

1.) Let's say that the circle on the graph below represents x. The arrow is pointing to all the numbers greater than x, which happens to be on -2. If it points right, this means that x can equal to any number greater than -2. So your answer is x > -2.

2.) For inequalities such as these, you can simplify just like what you do for normal equations. Let's isolate x.

$x - 7 > 10$