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klemol [59]
3 years ago
13

The diameter of a circle is 18 centimeters. what is the radius? d=18 cm give the exact answer in simplest form.

Mathematics
1 answer:
goldenfox [79]3 years ago
4 0
The diameter of the circle is 18 cm.

The radius is one half the diameter.
Therefore the radius is  18/2 = 9 cm

Answer: 9 cm
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in the figure below trianglePQM and triangleQRP are right triangles. the measure of lineQM is 6 and the measure of lineQP is 8.
Kipish [7]

Answer:

Option 4 is correct. The length of PR is 6.4 units.

Step-by-step explanation:

From the given figure it is noticed that the triangle PQR and triangle MQR.

Let the length of PR be x.

Pythagoras formula

hypotenuse^2=base^2+perpendicular^2

Use pythagoras formula for triangle PQM.

PM^2=QM^2+PQ^2

PM^2=(6)^2+(8)^2

PM^2=36+64

PM^2=100

PM=10

The value of PM is 10. The length of PR is x, so the length of MR is (10-x).

Use pythagoras formula for triangle PQR.

PQ^2=QR^2+PR^2

(8)^2=QR^2+x^2

64-x^2=QR^2                   .....(1)

Use pythagoras formula for triangle MQR.

MQ^2=QR^2+MR^2

(6)^2=QR^2+(10-x)^2

36=QR^2+x^2-20x+100

36-x^2+20x-100=QR^2        .... (2)

From equation (1) and (2) we get

36-x^2+20x-100=64-x^2

20x-64=64

20x=128

x=6.4

Therefore length of PR is 6.4 units and option 4 is correct.

3 0
3 years ago
Which number should be added to both sides of the equation to complete the square x^2-10x=7
mixer [17]

Answer:

  25

Step-by-step explanation:

The number that needs to be added is the square of half the x-coefficient:

  (-10/2)^2 = 25

_____

Adding that gives ...

  (x -5)^2 = 32

  x = 5 ± 4√2

5 0
4 years ago
Please show your work!!
jarptica [38.1K]

Answer:OK ILL HELP

Step-by-step explanation:Combine  

1

2

and  

x

.

y

=

x

2

−

3

6 0
3 years ago
Need help on this problem
trasher [3.6K]
The answer to the question

3 0
3 years ago
Try it, let's see can u do or not
Firlakuza [10]

Answer:

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
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