If all the angles of a triangle are less than 90∘ , then it is called triangle.

acute-angled

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right-angled

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obtuse-angled

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Solution

The correct option is A acute-angled
If all three angles of a triangle are less than 90 $^{\circ}$ , then it is called as an acute-angled triangle.

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A triangle whose all angles are less than $90^{\circ}$ is called a/an ________ triangle.

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