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3 years ago

Find the area of a regular pentagon with radius 9mm

1 answer:

6 0

The area is calculated by using the formula A=(r^2)*n*sin(360/n)/2 where n is the number of sides which is 5 for pentagon and r is the radius which is 9 mm. So, using the formula, the answer is 51.4 mm^2.

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What relationship between the circumference and the diameter is suggested by your observation?

TiliK225 [7]

Answer:

The ratio of circumference to diameter is a constant

Step-by-step explanation:

The first line on the page tells you the relation: the ratio of the circumference to the diameter is about 3.14.

Another way to say this is that the circumference is about 3.14 times the diameter.

4 0

4 years ago

Given: measure of angle KJ = 124°, measure of IC =38° Find: m∠CQJ, m∠LIJ.

VLD [36.1K]

Answer:

Part 1) $m$

Part 2) $m$

Step-by-step explanation:

Part 1) Find the measure of angle CQJ

we know that

The measure of the interior angle is the semi-sum of the arcs comprising it and its opposite.

$m$

$arc\ IK+arc\ CJ=360\°-(arc\ IC+arc\ KJ)$

substitute the values

$arc\ IK+arc\ CJ=360\°-(38\°+124\°)=198\°$

$m$

Part 2) Find the measure of angle LIJ

step 1

Find the measure of angle IJL

we know that

The inscribed angle is half that of the arc it comprises.

$m$

substitute the values

$m$

step 2

Find the measure of angle ILJ

we know that

The measurement of the external angle is the semi-difference of the arcs it encompasses.

$m$

substitute the values

$m$

step 3

Find the measure of angle LIJ

Remember that the sum of the interior angles of a triangle must be equal to 180 degrees

In the triangle LIJ

$m$

substitute the values

$m$

3 0

4 years ago

HELP WILL GIVE BRAINLIEST

AnnyKZ [126]

<h2>Good evening ,</h2>

Answer:

q=-10

Step-by-step explanation:

D:y=-3x+q

let’s find q

A(-4,2)∈D ⇔ 2=-3(-4)+q ⇔ q=-10

then D:y=-3x-10

look at the photo for more details.

______________

5 0

3 years ago

Kristen earns $13.50 for each hour she works. On Monday she worked 4 hours. She also worked Tuesday. If she earned a total of $1

insens350 [35]

Answer:8 hours on Tuesday

Step-by-step explanation:13.50 x 4=54

162-54=108

108÷13.50=8

8 0

3 years ago

The area of a circle is 28.26 square yards. what is the circle's circumference? a=28.26 yd2

Levart [38]

$area \: = \pi {r}^{2} \\ circumference = 2\pi \: r$
where r = radius
$\pi {r}^{2} = 28.26 \: {yd}^{2} \\ {r}^{2} = 28.26 \div \pi \\ {r}^{2} = 8.99 = 9 \\ \sqrt{ {r}^{2} } = r = \sqrt{9} = 3$
circumference = C
$c = 2\pi \: r = 2(3) \times \pi \\ = 18.85 \: yd = 18.9 \: yd$

5 0

3 years ago

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