Question
Which one of the following is not a right angle triangle?
The correct answer is
2 cm, 3 cm, 4 cm
By the converse of the Pythagorean theorem, \(2^2 + 3^2 = 4 + 9 = 13 \neq 4^2 = 16\), so 2 cm, 3 cm, 4 cm does not form a right triangle, while the other three sets are multiples of the 3-4-5 triple.
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Important Questions from Triangles
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In ΔABC, D is a point on BC such that ∠ADB = 2∠DAC, ∠BAC = 70° and ∠B = 56°. What is the measure of ∠ADC?
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