Question

Triangle ABC has perimeter 20 cm. AB = 7 cm. BC = 4 cm. By calculation, deduce whether triangle ABC is a right–angled triangle.

Answer 1

Answer:

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Answer 2

Answer:

By calculation, deduce whether triangle ABC is a right-angled triangle. AC is the hypotenuse of the triangle because it is the longest length. ... Pythagoras's Theorem: a2 + b2 = c242 + 72 = 16 + 49 = 65Where AC = c, c2 = 65 If c = 9, then c2 = 81, however when using Pythagoras, c2 = 65.

Step-by-step explanation:

Therefore, Pythagoras's Theorem cannot be use and the triangle ABC is not a right-angle triangle.