Question

an equilateral triangle whose each side is of a cm is rotated along a side as an axis then what is the area of the figure formed by it​

Answer 1

Answer:

If an equilateral triangle of side a is rotated along an axis it forms 2 3D cones with a common base.

Area of a cone = pie × r× l

= pie × a/2 × a

= 22/7 ×a/2 × a

= 11/7 a^2 sq cm

Hence area of the 3D shape formed is 2 area

= 22/7 a^2 sq cm

Step-by-step explanation: