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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

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