If it is an equilateral triangle with 3 equal sides of 4cm then its perimeter is 12cm
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It does not have a circumference but its perimeter is: 4+6+8 = 18 cm
Well, honey, that's no ordinary triangle, that's an isosceles triangle. Two sides are the same length, so it's like those twins you can't tell apart. Just make sure to measure those angles too, we don't want any surprises popping up like a bad reality show.
It is: 8*4 = 32 cm
Square side 3cm. Rectangle 2cm x 4cm. Equilateral triangle side 4cm.
It will be a right angle triangle with a base of 3cm, a height of 4cm and a hypotenuse of 5cm