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3 years ago

In ΔIJK, the measure of ∠K=90°, the measure of ∠I=38°, and JK = 7.4 feet. Find the length of KI to the nearest tenth of a foot.

Mathematics

1 answer:

dem82 [27]3 years ago

3 0

Answer:

9.5

Step-by-step explanation:

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Please help with this question!! I need serious help!!

asambeis [7]

Answer:

<h2>The circumference is multipled by 4.</h2>

Step-by-step explanation:

The formula of an area of a circle"

$A=\pi r^2$

The formula of a circumference of a circle:

$C=2\pi r$

The area multipled by 16:

$16A=16\pi r^2\\\\16A=\pi(4^2r^2)\\\\16A=\pi(4r)^2$

The radius has increased fourfold, therefore:

$C'=2\pi(4r)=4(2\pi r)=4C$

The circumference is multipled by 4.

You can calculate the area and check the circumference:

$r=11.6\ in\\\\A=\pi(11.6)^2=132.56\pi\\\\16A=(16)(134.56\pi)=2152.96\pi\ in^2$

Calculate the radius:

$\pi r^2=2152.96\pi$ <em>divide both sides by π</em>

$r^2=2152.96\to r=\sqrt{2152.96}\\\\r=46.4\ in$

Calculate the circumference of both circles:

$r=11.6\ in\\\\C=2\pi(11.6)=23.2\pi\ in$

$r=46.4\ in\\\\C'=2\pi(46.4)=92.8\pi\ in$

$\dfrac{C'}{C}=\dfrac{92.8\pi}{23.2\pi}=4\to C'=4C$

5 0

2 years ago

Ten minus One-third of a number is 4

zloy xaker [14]

Ok, so you automatically know that you are subtracting 6 from 10 to get 4. So, in order to figure out how it is 1/3 of that number, it is going to be multiplied by 3, getting 18. So, the number would be 18.

6 0

3 years ago

Read 2 more answers

What number must you add to the expression below to complete the square? x^2-20x?

polet [3.4K]

We have that
x²<span>-20x
</span><span>Group terms that contain the same variable
</span>(x²-20x)
Complete the square
(x²-20x+10²)------> (x-10)²

the answer is
the number must be 100

5 0

3 years ago

On a certain marathon course, a runner reaches a big hill that is at least 10 miles into the race. If a total marathon is 26.2 m

maria [59]

If the marathon is 26.2 miles in total and the runner in 10 miles into the race then he has another 16.2 miles to go.

6 0

3 years ago

Helpppppppppppppoppppp

STALIN [3.7K]

Answer:

it would be 75

Step-by-step explanation:

if add 10+ 10+ 30 + 25 its would be 75

3 0

3 years ago