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Pythagoras Theorem

The Pythagoras Theorem states that in a right-angled triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides. It is a fundamental principle in geometry used to find the unknown length of a side in a right triangle when the other two sides are known.

Key Concepts

The theorem applies exclusively to right-angled triangles, where one angle is exactly 90 degrees.
The hypotenuse is always the longest side of the right triangle and is positioned opposite to the right angle.
The converse of the Pythagoras Theorem is also true, meaning if the square of one side equals the sum of the squares of the other two sides, the angle opposite the first side is a right angle.

Formula & Equation

c2=a2+b2c^2 = a^2 + b^2

c represents the length of the hypotenuse, while a and b represent the lengths of the base and the perpendicular.

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Common Misconceptions

Myth: Applying the Pythagoras Theorem to any type of triangle, such as acute or obtuse triangles.
Fact: The theorem is strictly valid only for right-angled triangles. For other triangles, different rules like the Law of Cosines must be used.

Real World Applications

Calculating the length of a ladder needed to reach a specific height on a wall when the distance from the base of the wall is known.
Finding the shortest straight-line distance between two points on a map using their horizontal and vertical coordinates.

Frequently Asked Questions

What is the formula for the Pythagoras Theorem?
The formula is c^2 = a^2 + b^2, where c is the hypotenuse, and a and b are the other two sides of a right-angled triangle.
How do you find the hypotenuse of a right triangle?
To find the hypotenuse, square the lengths of the base and perpendicular, add them together, and then calculate the square root of that sum.

Keep Learning

Converse of Pythagoras TheoremRight Triangle SimilarityRight Triangle