Right-angled triangle with sides 15 cm and 8 cm.
Use the Pythagorean theorem to find the hypotenuse (the longest side).
Pythagorean theorem: Hypotenuse² = Perpendicular² + Base²
Hypotenuse² = 15² + 8²
Hypotenuse² = 225 + 64
Hypotenuse² = 289
Hypotenuse = √289
Hypotenuse = 17 cm
Perimeter = Sum of all sides
Perimeter = 15 cm + 8 cm + 17 cm
Perimeter = 40 cm
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