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Maths FROM 2
Chap7: triangles
Finding one side of a right-angled triangle using Pythagoras theoremA
b c
C a B
From Pythagoras theorem
(AB)2 = (AC)2 = (BC)2
c2 = a2 + b2
where a, b and c are lengths of the sides AB, BC and AC.
Ex: find a
3 5
a
Solution:
From c2 = a2 + b2, 52 = 32 + a2
a2 = 25-9 = 16
= 4, a = 4
par Claude Foumtum