Question

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!

Answer 1

Answer:

triangle ABC is "not" a right-angled triangle

Step-by-step explanation:

AB=8cm

BC=5cm

perimeter = 22cm

CA = 22 - 8 - 5 = 9

8² + 5² = 89

9² = 81

AB² + BC² ≠ CA²