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Lengths of the sides of a triangle are 3 cm, 4 cm and 5 cm. The triangle is___________.

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obtuse-angled triangle

acute angled triangle

isosceles right triangle

right-angled triangle

answer is C.

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Detailed Solution

Since these sides satisfy the Pythagoras theorem, therefore it is right angled triangle. Lengths of the sides of a triangle are 3 cm, 4 cm, and 5 cm.
According to Pythagoras theorem,

3² + 4² = 5²

=> 9 + 16 = 25

=> 25 = 25 ....... (satisfied)

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