Classify the triangle as acute-angled, right-angled and obtuse-angled triangles on the basis of their angles which have been given below-:
$75 °, 20 °, 85 °$

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Solution

Since all of the angles of the given triangle is less than $90 °$ .
Therefore, it is an acute-angled triangle.

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\begin{matrix} a . 90^{\circ}, 45^{\circ}, 45^{\circ} b . 60^{\circ}, 60^{\circ}, 60^{\circ} c . 80^{\circ}, 60^{\circ}, 40^{\circ} d . 92^{\circ}, 50^{\circ}, 38^{\circ} e . 120^{\circ}, 50^{\circ}, 10^{\circ} f . 90^{\circ}, 35^{\circ}, 55^{\circ} \end{matrix}

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