# What triangles have a 90 degree angle?

## What triangles have a 90 degree angle?

Right triangles are triangles in which one of the interior angles is 90 degrees, a right angle. Since the three interior angles of a triangle add up to 180 degrees, in a right triangle, since one angle is always 90 degrees, the other two must always add up to 90 degrees (they are complementary).

### What makes a 90 degree angle?

When two straight lines intersect each other at 90˚ or are perpendicular to each other at the intersection, they form the right angle. A right angle is represented by the symbol ∟.

Is 90 degrees a right triangle?

Right Triangle A right angle has a value of 90 degrees (90∘ ). A right triangle is a triangle in which one angle is a right angle. The side opposite the right angle is called the hypotenuse (side c in the figure). The sides adjacent to the right angle are called legs (sides a and b ).

Is this triangle right angled?

It is possible to determine if a triangle contains a right angle using Pythagoras’ theorem . If the squares of the two shorter sides add up to the square of the hypotenuse, the triangle contains a right angle.

## How do you find the area of a 90 degree triangle?

Area of one right triangle = 1/2 × l × w. We usually represent the legs of the right-angled triangle as base and height. Thus, the formula for the area of a right triangle is, Area of a right triangle = 1/2 × base × height.

### What is a 90-degree?

A 90-degree angle is a right angle and it is exactly half of a straight angle. A 90 degrees angle always corresponds to a quarter turn. Rectangle and square are the basic geometric shapes that have a measurement of all four angles as 90 degrees.

Are the sides of a right triangle equal?

A right triangle has one angle equal to 90 degrees. A right triangle can also be an isosceles triangle–which means that it has two sides that are equal.

How do you know if 3 sides make a right triangle?

Explanation: To check if the sides are a right triangle, check if the sum of the squares of the two smaller sides equals the length of the square of the longest side. In other words, check if it works with the Pythagorean theorem: Does 32+42 equal 62?

## What triangle has one angle that is exactly 90 degrees?

The right triangle has one 90 degree angle and two acute (< 90 degree) angles. Since the sum of the angles of a triangle is always 180 degrees… The two sides of the triangle that are by the right angle are called the legs… and the side opposite of the right angle is called the hypotenuse.

### Does a triangle have to have a 90 degree angle?

An equilateral triangle has 3 equal sides. In an acute triangle, all of the angles will measure less than 90 degrees. A right triangle will always have one 90-degree angle. An obtuse triangle will always have one angle whose measure is greater than 90 degrees but at the same time less than 180 degrees.

What is a triangle that has a 90 degree angle called?

A right triangle (American English) or right-angled triangle (British English) is a triangle in which one angle is a right angle (that is, a 90-degree angle).

What is triangle with 90 degrees called?

90 Degree Angle Triangle. In 90 degree angle triangle, two of the sides are sides of the right angle. These are called the legs of the right triangle. The third side is opposite the right angle. It is called the hypotenuse of the right triangle.