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Triangle ABC has a perimeter of 22cm

AB=8cm
BC=5cm
By calculation,deduce whether triangle ABC is a right-angled triangle

(This question is part of the Pythagoras’ Theorem topic)

Any ideas would be greatly appreciated!

1 Answer

5 votes

Answer:

triangle ABC is "not" a right-angled triangle

Explanation:

AB=8cm

BC=5cm

perimeter = 22cm

CA = 22 - 8 - 5 = 9

8² + 5² = 89

9² = 81

AB² + BC² ≠ CA²

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