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Test: The Pythagorean theorem

Dynamic tasks on legs, hypotenuse, rectangle diagonals, coordinate distance and practical applications.

Question qty: 10
Duration in minutes: 20
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Time left: 00:00:00

Sample questions

  • A destination can be reached by walking a m east and b m north, or directly. Which route is shorter?
  • The legs of a right triangle are a cm and b cm. Find the hypotenuse.
  • If a triangle satisfies a² + b² = c², what follows from the converse Pythagorean theorem?
  • Find the distance between (x1, y1) and (x2, y2).
  • A rectangle has sides a cm and b cm. Find its diagonal.
  • A right triangle has hypotenuse c cm and one leg b cm. Find the other leg.
  • Which set of three side lengths can form a right triangle?
  • The foot of a ladder is a m from a wall and its top reaches h m high. How long is the ladder?

The Pythagorean theorem

In a right triangle, the sum of the squares of the legs equals the square of the hypotenuse: a² + b² = c². The hypotenuse lies opposite the right angle and is always the longest side. Find a missing leg by subtracting the known leg squared from c².

Applications

The theorem applies to rectangle diagonals, coordinate distances and practical length problems. Confirm that the triangle is right-angled, identify the hypotenuse and only then substitute values. The answer uses units of length, not square units.