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Question

Find the third side in the given triangle. Name the theorem used to find the third side. What are such triangles called? [3 MARKS]

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Solution

Name: 1 Mark
Theorem: 1 Mark
Answer: 1 Mark

Since C is 90, the following is a right-angled triangle.
The theorem used is known as Pythagoras Theorem.
In a right angled triangle,
Base2 + perpendicular2 = hypotenuse2 (Pythagaros's Theorem)
Or, AB2 = BC2 + AC2
Or, AB2 = 16 + 9 = 25
Or, AB = 25 = 5

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