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Question
Lengths of sides of a triangle are 3 cm, 4 cm and 5 cm. The triangle is ______.
Options
Obtuse angled triangle
Acute-angled triangle
Right-angled triangle
An Isosceles right triangle
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Solution
Lengths of sides of a triangle are 3 cm, 4 cm and 5 cm. The triangle is right-angled triangle.
Explanation:
Lengths of the sides of a triangle are 3 cm, 4 cm and 5 cm.
Now, 32 + 42 = 9 + 16 = 25 = 52
i.e., Sum of squares of two sides is equal to the square of third side.
Therefore, the triangle is right angled triangle.
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