0
How many different isosceles triangles have a perimeter of 18 and sides whose lengths are natural numbers?
Wiki User
∙ 13y ago
There are three or there are four, depending which definition you have been taught.
If you are of the school that is taught that an isosceles triangle has 2 equal sides and 2 equal angles, there are three.
If, however, you were taught that an isosceles triangle has at least 2 equal sides and at least 2 equal angles, then there are four:
5+5+8
6+6+6 Note: Strictly, this one is equalateral but conforms to an isosceles by the second theory.
7+7+4
8+8+2
The two equal sides, when added together, must be equal to or greater than the third side or they will not join up.
Wiki User
∙ 13y ago
Add your answer:
Earn +20 pts
Are some scalene triangles also isosceles triangles?
Scalene triangles those triangles in which all the sides are of different lengths, but in isosceles triangles two sides of the triangle are equal in length. Therefore, no scalene triangle can ever be isosceles.
All isosceles triangles are also equilateral triangles?
No, all isosceles triangles are not equilateral triangles. An isosceles triangle is a triangle that has two sides of equal length. An equilateral triangle is a triangle that has all three sides of equal length. Therefore, it is possible for a triangle to be isosceles but not equilateral. For example, a triangle with sides of lengths 3, 3, and 4 is an isosceles triangle, but it is not an equilateral triangle because all its sides do not have the same length. On the other hand, all equilateral triangles are also isosceles triangles because they have two sides of equal length. My recommendation ʜᴛᴛᴘꜱ://ᴡᴡᴡ.ᴅɪɢɪꜱᴛᴏʀᴇ24.ᴄᴏᴍ/ʀᴇᴅɪʀ/372576/ꜱᴀɪᴋɪʀᴀɴ21ᴍ/
How many triangles exist with the given side lengths 4cm 4cm 7cm. Only one triangle No triangles or infinite triangles?
It is an isosceles triangle with 2 equal sides.
What is the perimeter of a dodecagon?
The perimeter of a dodecagon is the sum of the lengths of its 12 sides. These sides may be of different lengths.
How do you classify a triangle with side lengths 10m 10m 12m?
I would place this triangle in the category of isosceles triangles, because the 10m side and the 10m side have equal lengths.
What are isosceles triangels?
Isosceles triangles are triangles in which two of the three sides have different lengths.
Why are pyramids isosceles triangles?
Pyramids are not isosceles triangles but their triangular faces can form the image of an isosceles triangle if they have two sides of equal lengths and a base of a different length.
Are some scalene triangles also isosceles triangles?
Scalene triangles those triangles in which all the sides are of different lengths, but in isosceles triangles two sides of the triangle are equal in length. Therefore, no scalene triangle can ever be isosceles.
Perimeter of isosceles triangle?
It is the sum of the lengths of its sides.
Do triangles always have three lines of symmetry?
No, scalene triangles, which have sides of different lengths, have none. Isosceles triangles, with only two sides the same, only have one.
What conditions will ensure that two isosceles triangles are congruent?
The triangles have the same side lengths.
What triangles always have three sides of different lengths?
Scalene triangles. All three are different: Scalene Two are the same: Isosceles All three are the same: Equilateral
Formula of perimeter of isosceles triangle?
Lengths of: equal side+equal side+base = perimeter
How do you get the perimeter of an isosceles triangle?
Add the lengths of the three individual sides.
What is an isosceles and scalene?
They are triangles. An isosceles triangle has two sides that are equal length, and the other side would be a different length. A right triangle could be an isosceles triangle. On the other hand, a scalene triangle has all of its sides different lengths.
The perimeter of an isosceles triangle is 24 cm what might the lengths of the sides be?
24cm each
All isosceles triangles are also equilateral triangles?
No, all isosceles triangles are not equilateral triangles. An isosceles triangle is a triangle that has two sides of equal length. An equilateral triangle is a triangle that has all three sides of equal length. Therefore, it is possible for a triangle to be isosceles but not equilateral. For example, a triangle with sides of lengths 3, 3, and 4 is an isosceles triangle, but it is not an equilateral triangle because all its sides do not have the same length. On the other hand, all equilateral triangles are also isosceles triangles because they have two sides of equal length. My recommendation ʜᴛᴛᴘꜱ://ᴡᴡᴡ.ᴅɪɢɪꜱᴛᴏʀᴇ24.ᴄᴏᴍ/ʀᴇᴅɪʀ/372576/ꜱᴀɪᴋɪʀᴀɴ21ᴍ/
