All categories

3 years ago

A circle has a radius 30 cm. What is the area? Show your work.

Mathematics

1 answer:

Talja [164]3 years ago

8 0

Answer:

I believe the area = 2,826

Step-by-step explanation:

A=pie×radius²

A= 3.14×30²

A=3.14×900

A=2,826

You might be interested in

726 estimated thank you , vicky

malfutka [58]

726 to the hundred's is 700
726 to the ten's is 730

6 0

3 years ago

Help worth 20 points due in 10 minutes

Black_prince [1.1K]

Answer:

answer is option A: 13m+8

5 0

3 years ago

Solve the triangle. A = 32°, a = 19, b = 14

Paha777 [63]

Answer:

A = 32°, a = 19, b = 14, B=22.98°, C = 125.02°, c = 29.36

Step-by-step explanation:

We have two sides of the triangle and we have an angle.

A = 32 °, a = 19, b = 14

We use the sine theorem to find the angle B.

We know that according to the sine theorem it is true that:

$\frac{sin(A)}{a}=\frac{sin(B)}{b}=\frac{sin(C)}{c}$

$\frac{sin(32\°)}{19}=\frac{sin(B)}{14}$

$sin(B)=14*\frac{sin(32\°)}{19}\\\\B=Arcsin(14*\frac{sin(32\°)}{19})\\\\B=22.98\°$

We know that the sum of the internal angles of a triangle is always equal to 180.

So:

$C=180-32-22.98\\\\C=125.02\°$

Finally we find the c side

$\frac{sin(A)}{a}=\frac{sin(C)}{c}$

$\frac{sin(32\°)}{19}=\frac{sin(125.02)}{c}$

$0.02789=\frac{sin(125.02)}{c}$

$c=\frac{sin(125.02)}{0.02789}\\\\c=29.36$

8 0

3 years ago

Nine more than the product of a number and 2 is equal to 7

elena-s [515]

Answer is -1

explanation:

9 + 2x = 7

2x =-2

x = -1

6 0

3 years ago

Which of the following pairs is a solution to the following system of equations: - x + 3y = 9 2x + 5y = 4 A. (- 15, - 2) B. (- 1

vivado [14]

Answer: x = -3 y = 2 So (-3,2)

Step-by-step explanation:

- x + 3y = 9 Multiply everything by 2 then add to the second equation.

2x + 5y = 4

-2x +6y =18 then 2x-2x=0 Add the other terms and solve for y.

11y = 22 divide both sides by 11 yo get y = 2 Substitute that into either one and solve for x.

2x + 5y = 4

2x + 5(2) = 4

2x + 10 = 4 subtract 10 from both sides 2x = 4 -10

2x = -6 so divide both sides by 2 to get x = -3

4 0

3 years ago