The triangle is rotated about an axis then it creates a cone and the approximate circumference of the base is 63 mm. Then the correct option is C.
It deals with the size of geometry, region, and density of the different forms both 2D and 3D.
The equilateral triangle shown is rotated about line a.
Each side of the triangle measures 20 mm.
If the triangle is rotated about an axis then it creates a cone.
Then the radius of the cone will be
[tex]\rm r = \dfrac{20}{2} = 10 \ mm[/tex]
Then the height of the cone will be
[tex]\rm h = 20 \sin 60^o\\\\h = 17.32 \ mm[/tex]
Then the circumference of the base circle will be given as
[tex]\rm Circumference = 2 \pi r\\\\Circumference = 2 \pi \times 10\\\\Circumference = 62.8318 \approx 63 \ mm[/tex]
More about the geometry link is given below.
https://brainly.com/question/7558603
Answer:
C. A cone with a base circumference of about 63 mm !!!
Step-by-step explanation:
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