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3 years ago

Find the Area of the circle. Use 3.14 for π. Round your answer to the nearest tenth.

Mathematics

2 answers:

Zanzabum3 years ago

5 0

Answer:

1, 385.4 mi

Step-by-step explanation:

A = pi(r^2)

A = 3.14 x 21^2

A = 1385.44 mi

n200080 [17]3 years ago

3 0

Answer:

Area = 1384.7 square miles

Step-by-step explanation:

$Area = \pi r^2 = 3.14 \times 21^2 = 3.14 \times 21 \times 21 = 1384.74 = 1384.7 \ mi^2$

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If a triangle has a height of 7 centimeters and a base of 4 centimeters,what is the area

sattari [20]

Answer:

14cm^2

Step-by-step explanation:

Area of a triangle is (base×height)/2

(4×7)/2

28/2

=14 centimetres squared

8 0

3 years ago

4. ADEF is an equilateral triangle. E 24 20 D F

irinina [24]

By Pythagorean theorem

x²+GF²=EF² ( where G is the point of intersection of perpendicular lines)

now, GF=1/2 EF= 12

x²+12²=24²

x²=24²-12²

x²=432

x=√432

x=12√3

x≈20.78

7 0

3 years ago

Determine the amplitude (A), period (P), and phase shift (PS) of the function f(x)= 3sin(x-4)+9

Tpy6a [65]

ANSWER

D.
$A=3,P=2\pi,PS=(4,9)$

EXPLANATION

The given function is

$f(x) = 3 \sin(x - 4) + 9$

Comparing to the general form of a trigonometric sine function,

$f(x) = A \sin(Bx-C)+D$

$A=3$
The amplitude is absolute value of A

$|A| = |3| = 3$

$B=1$

The period is given by

$p = \frac{2\pi}{ B}$

$p = \frac{2\pi}{ 1} = 2\pi$

$C=4$

is a shift to the right of 4 units.

and

$D=9$

is an upward shift of 9 units

Therefore the phase shift is (4,9).

The correct answer is D

6 0

3 years ago

Will mark brainliest!! please hurry!

andriy [413]

Answer:

its 300

Step-by-step explanation:

ik its is bc i got it right

3 0

3 years ago

WILL GIVE A 5 STAR RATING A THANKS A BRAINLIEST and 12 points.

Sauron [17]

since there are 180 degrees in a triangle so :

65+72+y=180 add like terms

137 + y=180 now subtract 137

y= 180-137

y=43 degrees

4 0

3 years ago

Read 2 more answers