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

Question

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] · Answer 1 · 2022-02-06T03:46:32+03:00

Yuki888 [10]3 years ago

8 0

Answer:

B

Step-by-step explanation:

Did it on edge

zysi [14] · Answer 2 · 2022-02-06T02:42:31+03:00

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