Answer:
Measure of each side of equilateral triangle = 20 mm
When , we rotate the triangle about line a,which passes through mid point of any of three sides of equilateral triangle
We get the Shape of a Cone.
Distance from line a ,where it cuts one of sides of equilateral triangle to one of vertex of triangle= Radius of circle = 10 mm
→Circumference of a circle= 2 π r
= 2 × 3.14 × 10
=6.28 × 10
= 62.8 mm
= 63 mm (Approximately)
