There is a right-angle triangle with hypothenus H = 5 cm and side A = 3 cm. Find the length of the third side B using Pythagoras' Theorem.

Pythagoras' theroem states that on a right-angle triangle, the square of the longest side (hypothenus) is equal to the sum of the squares of the other two sides.

Therefore, H= A2 + B2 

52 = 32 + B2

25 = 9 + B2

B2 = 25 - 9

B = Square root(16)

B = 4 cm

Ashwin V. avatar
Answered by Ashwin V. Maths tutor

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