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
worty [1.4K]
3 years ago
6

The equilateral triangle shown is rotated about line a. Each side of the triangle measures 20 mm. What shape is created by the r

otation and what is the approximate circumference of the base? Circumference of a circle: C = 2πr a cylinder with a circumference of about 63 mm a cylinder with a circumference of about 126 mm a cone with a base circumference of about 63 mm a cone with a base circumference of about 126 mm
Mathematics
2 answers:
Yuki888 [10]3 years ago
8 0

Answer:

B

Step-by-step explanation:

Did it on edge

zysi [14]3 years ago
3 0

Answer:

a cone with a base circumference of about 126 mm

Step-by-step explanation:

Rotating a triangle about a line results in a cone created by the rotation.  This is because the segment at the bottom forms a circle, and the point at the top stays there; the three-dimensional figure with a circular base and a point at the top is a cone.

Since we rotate the segments about a line, this makes the length of the base the radius of the circle. This means the circumference would be

C = 2πr = 2(3.14)(20) = 125.6 ≈ 126 mm

You might be interested in
I need help ASAP. Thank you :)
kvasek [131]

m∠FDE = 52°

Solution:

Given data:

DE ≅ DF, CD || BE, BC || FD and m∠ABF = 116°

<em>Sum of the adjacent angles in a straight line = 180°</em>

m∠ABF + m∠CBF = 180°

116° + m∠CBF = 180°

m∠CBF = 64°

If CD || BE, then CD || BF.

Hence CD || BE and BE || FD.

Therefore BFCD is a parallelogam.

<em>In parallelogram, Adjacent angles form a linear pair.</em>

m∠CBF + m∠BFD = 180°

64° + m∠BFD = 180°

m∠BFD = 116°

<em>Sum of the adjacent angles in a straight line = 180°</em>

m∠BFD + m∠DFE = 180°

116° + m∠DFE = 180°

m∠DFE = 64°

we know that DE ≅ DF.

<em>In triangle, angles opposite to equal sides are equal.</em>

m∠DFE = m∠DEF

m∠DEF = 64°

<em>sum of all the angles of a triangle = 180°</em>

m∠DFE + m∠DEF + m∠FDE = 180°

64° + 64° + m∠FDE = 180°

m∠FDE = 52°

8 0
3 years ago
Find the distance between the points (-4, -20) and (20, -20)
Gnoma [55]

Answer:

Babes, see the pic for the answer...

3 0
3 years ago
Read 2 more answers
HELP ASP Lucy has a jewelry business. To make a certain necklace, she spends $3.38 on materials and $5.57 on labor. She then sel
Nataliya [291]

5.57 + 3.38 =
$8.95
15.99 - 8.95 = 7.04
4 0
3 years ago
Relatively Simple Math, pls lend a hand. 50 points and Brainliest
ivann1987 [24]
I think the answer is A
7 0
2 years ago
Read 2 more answers
helpppppp please I need help on this question if you can explain i will give brainliest if you can't then font please ​
lara [203]

Answer:

The answer is A

Step-by-step explanation:

Down 2 right 3. You can figure this out for other problems like this by choosing any point on the graph and following the slope. It's down because the 2 is negative and 3 is positive to it goes to the right.

5 0
2 years ago
Other questions:
  • Solve the equation for 0° ≤ x ≤ 90°. Round to the nearest degree. 8cotθ + 3 = 5
    15·1 answer
  • A bouquet has 6 red roses, 3 yellow roses and 3 white roses. Select all the combination of flowers that make up exactly 50% of t
    13·1 answer
  • In which figure is point G an orthocenter ?
    6·2 answers
  • Please help me with this question :)
    12·1 answer
  • What is the correct evaluation of x2 - y2 - z2, when x is equal to -2, y is equal to 3 and z is equal to 4?
    11·2 answers
  • Answer if you want to be worshiped
    11·2 answers
  • I’m taking a test rn please I need help!?
    9·1 answer
  • The new club sticker is in the shape of a triangle. It has a height of 8 inches and a base of 10 inches. The area of the club st
    6·1 answer
  • The diameter of a circle is 3 ft. Find the circumference to the nearest tenth.
    7·2 answers
  • Anybody Know This. ?
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!