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'A' squared, plus 'B' squared, must equal 'C' squared, but only if the 'C' side is the hypotenuse (long side).

A right (or left) triangle MUST have ONE 90-degree angle.

Q: What do the side lengths of a triangle need to be to be considered a right triangle?

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you need to have at least 2 values of the lengths of the triangle and then you can find the angle by sine, cosine or tangent formulas you may try this online calculator for right triangles. http://www.rillocenter.com/calculate/trigonometry.html

An infinite number. All you need is any right triangle where the product of the lengths of the two legs is 40.

The answer depends on what information you have but, basically, you need to add together the lengths of the three sides of the triangle.

It can be but need not be.

To find the area of a triangle, you need the length of the base and the height. If the triangle has a base of 19 cm and a height of 21 cm, the area would be (1/2) * base * height = (1/2) * 19 cm * 21 cm = 199.5 cm^2. To find the perimeter of a triangle, you need to add the lengths of all three sides. Without knowing the lengths of the other sides, the perimeter cannot be determined.

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you need to have at least 2 values of the lengths of the triangle and then you can find the angle by sine, cosine or tangent formulas you may try this online calculator for right triangles. http://www.rillocenter.com/calculate/trigonometry.html

An infinite number. All you need is any right triangle where the product of the lengths of the two legs is 40.

A hypotenuse is the longest side of a right angled triangle. The length of a hypotenuse can be found using the Pythagorean Theorem. This states that in a right angled triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the other two sides. This means that to find the length of the hypotenuse, you need to know the lengths of the other two sides.

We know that a right triangle is a triangle having a right angle, where the side opposite the right angle is the hypotenuse, and the perpendicular sides are the legs of the right triangle. The Pythagorean theorem gives the relationship between the lengths of the sides of a right triangles. In the case where you know only the measure lengths of the sides of a triangle, you need to test these measures. If one of the sides of the triangle has a square measure equal to the sum of the square measures of two other sides, then this side is called the hypotenuse and opposite to this side is a 90 degree angle, which is a right angle. So, you can say that this triangle is a right triangle. Pythagorean triple are very helpful to determine a right triangle, such as: (3, 4, 5), (5,12,13), (8, 15, 17), (7, 24, 25), and (20, 21, 29).

They need not be. You can have a right scalene triangle.

The answer depends on what information you have but, basically, you need to add together the lengths of the three sides of the triangle.

The only triangle that has a hypotenuse is a right-triangle. The hypotenuse is the side opposite the right angle, so the angle is always 90 degrees. In this case, if you're just finding the angle then you don't need to know what the side lengths are.

It can be but need not be.

It can be but need not always be.

All triangles have an altitude. In fact they all have three of them. Whether or not they have an altitude, the important thing when trying to determine the length of the hypotenuse is what information you have on the lengths of the sides. Altitudes, medians can help determine the lengths of sides, as can angles. You need a minimum of 3 pieces of information. There is only one in the question: the fact that the triangle has a right angle.

A right triangle is a triangle that includes a 90Â° angle.Right triangles are significant because you can apply trigonometric functions and the Pythagorean theorem to them to find unknown side lengths or angles.sinA = cosB = a/ccosA = sinB = b/ctanA = a/ba2 + b2 = c2

Not normally but if it has angles of 90, 45 and 45 degrees it is then both a right angle and an isosceles triangle