Q: What is the perimeter of an equilateral triangle with 25cm sides?

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25cm x 4 sides = 100 cm perimeter

Regular = all sides equal so all sides of 25 cm. Decagon = 10 sides. So perimeter = 10*25cm = 250 cm.

The perimeter is 20 cm

100 cm

Yes, it definately can and always will be. Since you wrote that both pentagons are regular, all sides (and angles) are equivalent to each other. On the first pentagon, one side measured 5cm, so therefore the rest of the sides total up to 25cm. Since the second pentagon has perimeter 25cm, the pentagons must be congruent.

Related questions

25cm x 4 sides = 100 cm perimeter

A triangle with side a: 40, side b: 25, and side c: 25cm has an area of 300cm2

Regular = all sides equal so all sides of 25 cm. Decagon = 10 sides. So perimeter = 10*25cm = 250 cm.

Then the square will have 4 equal sides of 5cm with a perimeter of 20cm and an area of 25 square cm

The perimeter is 20 cm

P =100

A pentagon has 5 sides. A regular pentagon has sides of all the same length. So a regular pentagon of side 5cm has a perimeter of 5 x 5cm = 25cm.

If you are talking about a rectangle, then it is 90 cm.

100 cm

Yes, it definately can and always will be. Since you wrote that both pentagons are regular, all sides (and angles) are equivalent to each other. On the first pentagon, one side measured 5cm, so therefore the rest of the sides total up to 25cm. Since the second pentagon has perimeter 25cm, the pentagons must be congruent.

P = 20cm

Using the sine rule in trigonometry its area is 192.885 square cm and its perimeter is 65.379 cm both rounded to three decimal places.