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Q: What triangles cannot form a triangle?

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if a triangle is acute, then the triangle is equilateral

No. Because two are triangles and three are rectangles. A triangle cannot be congruent to a rectangle!

Only if they are in the form of an isosceles or an equilateral triangle.

no. In fact a right angled triangle cannot be equilateral. An equilateral triangle is also equiangular: that is, all its angles are equal. The sum of all three angles of a [plane] triangle must be 180 degrees and so they cannot be 90 deg each.

Use three sticks to form a triangle. Use the other three sticks to form an inverted triangle and place it on top of the first. You will have two large triangles and six small ones - eight triangles in all. The shape is also known as the Star of David.

Related questions

if a triangle is acute, then the triangle is equilateral

A triangle is only a regular triangle in the form of an equilateral triangle

Firstly, take out three toothpicks that form a triangle. You will be left with two triangles. Secondly, place all three toothpicks to form a triangle above the centre of the two triangles. Four small triangles and a large triangle will be formed, which makes them five triangles. Example: At first: /_\/_\/_\ Imagine that these are three triangles (nine toothpicks), with the sides joined. Secondly: /_\/_\ Imagine that you have taken away one triangle (three toothpicks). Thirdly: Place the three toothpicks to form a triangle above the two triangles. Imagine that the sides are joined. Four small triangles are formed. The four triangles make up a large triangle, which makes them five. /_\ /_\/_\

A circle, for sure.

There is no triangle below. Furthermore, there are four measures given and some of the triplets cannot form triangles.

No. Because two are triangles and three are rectangles. A triangle cannot be congruent to a rectangle!

None. A quadrilateral cannot be similar to any triangle.

Only if they are in the form of an isosceles or an equilateral triangle.

no. In fact a right angled triangle cannot be equilateral. An equilateral triangle is also equiangular: that is, all its angles are equal. The sum of all three angles of a [plane] triangle must be 180 degrees and so they cannot be 90 deg each.

Use three sticks to form a triangle. Use the other three sticks to form an inverted triangle and place it on top of the first. You will have two large triangles and six small ones - eight triangles in all. The shape is also known as the Star of David.

Triangles do not necessarily have right angles, but they can. A triangle with a right angle is called a right triangle. A triangle cannot have more than one right angle, since the total of all three angles of every triangle equals 180°.

No, a triangle cannot have two angles. Triangles always have three sides and three angles that add up to 180 degrees.

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