No. It's 9 times greater. The area changes according to the square of
the number that you use to multiply all the linear dimensions.
"3 squared" = 32 = 3 x 3 = 9
If you made the dimensions of the triangle 10 times bigger, the area
would become 102 = 100 times greater.
If only the length is changed and all other dimensions left unchanged, the volume will also triple.
27
10 x 3 = 30
C1 = pi x D, C2 = pi x 3 x D, so the circumference is also tripled.
The circle becomes an oval
No - if the lengths of the sides are all increased by a factor of 3, the angles remain unchanged. You just wind up with a "similar" triangle 3 times the size of the original. A quick counterexample would be to consider what would happen if the angles DID change. The sum of the angles in the original triangle should be 180°. If the angles in the new, larger triangle tripled in size, the sum of the angles in the bigger triangle would be 540° - but the sum of the angles of a triangle should always remain 180°.
If the radius is tripled then the Area will be greater by a factor of 9. And the circumference will be greater by a factor of 3.
three
The perimeter will be tripled.
It is multiplied by nine.
tripled
The volume goes up by 9 times
it becomes three times larger
Volume is proportional to the cube (3rd power) of the linear dimensions.If the side of the cube is tripled, the volume increasesby a factor of (3)3 = 27 .
It will be 9 times as large. And that will be true for any plane shape, not just an equilateral triangle.
The original volume is multiplied by 27.
The effect on the total surface area of one dimension being doubled or tripled cannot be calculated. You either need to know all three dimensions or all three dimensions must be doubled, not just one dimension (or demension / demansion as you call them).