1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
lozanna [386]
3 years ago
8

Find the perimeter of the semicircle when diameter is 3.5 cm. (1 Point)

Mathematics
1 answer:
Feliz [49]3 years ago
8 0

● Answer:

8.995 cm

● Step-by-step explanation:

P = d + L/2

d = 3.5 cm

L/2 = 2pi×r/2

= pi×d/2

= 3.14×3.5/2

= 5.495 cm

P = 3.5cm + 5.495

= 8.995 cm

You might be interested in
If arc EF = 151°, find mEDF.
user100 [1]
There is a theorem that says that this angle (formed by thre points on the circumference) is half such arc called EF.

We can deduct it as well.

1) Call O the center of the circle. The central angle (EOF) = arc EF = 151°

2) Draw a chord from F to D and other chord from D to E.

You have constructed two triangles, FOD and DOE.

3) Triangle FOD has two sides equals (because both are the radius of the circcle). Then, this is an isosceles triangle and it has two angles of the same measure. Call this measure a.

4) Triangle DOE is also isosceles, for the same reason explained in the poiint 3. Call the measure of its equal angles b.

5) The sum of the angles of the two triangles is 180° + 180 ° = 360°.

This is a + a + b + b + (360 - central angle) = 360°

=> 2a + 2b = central angle
=> 2(a+b) = cantral angle
=> (a+b) = central angle / 2 = 151° / 2 =71.5°

(a+b) is the angle that you are looking for.

Then the answer is 71.5°

 
4 0
3 years ago
Solve.
lions [1.4K]

Answer:

b=9,a=12

Step-by-step explanation:

I solved by substitution:

b = 3/4a  ---> plug this into the other equation

a + b = 21   is now    a + 3/4a = 21

Reduce: 7/4a = 21

a = 12

Now solve for b:

b=3/4a is now b=3/4(12)

b=9

6 0
3 years ago
Read 2 more answers
5 fewer than a number, k.
blagie [28]

Answer:

k-5. The question seems incomplete though.

5 0
2 years ago
Read 2 more answers
What is the difference between 3/7, and 1/14
Fofino [41]
5/14 is the difference between 3/7 and 1/14.
4 0
3 years ago
How is the 6 not in the thousands place in 364,021
Ber [7]

In this case 6 would in the ten thousands place. 4 is in the thousands place.

3 0
3 years ago
Other questions:
  • Let x be a random variable that represents the batting average of a professional baseball player. Let y be a random variable tha
    14·1 answer
  • Rodger has 47 cars . Can he group the cars in more than two ways?
    6·1 answer
  • If (x + y)^2 = 1 and xy = -4, what is the value of x^2 + y^2?
    5·1 answer
  • Students can earn a certificate at a:
    7·2 answers
  • Classify the triangle shown below. Check all that apply.
    8·2 answers
  • Two integers a and b have a product of -33. What is the least possible sum of a and b
    15·1 answer
  • Is -2.7,-9,-30,-100 a geometric sequence ?
    12·1 answer
  • Is 1/4 and 3/8 proportional
    15·2 answers
  • Someone please help me
    5·1 answer
  • Raj had 12 gallon of orange juice. He used ​89 of the juice to make punch.
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!