Which of the following are angles of Obtuse angled triangle?

30^{o}, 90^{o}, 60^{o}

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30^{o}, 70^{o}, 80^{o}

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120^{o}, 20^{o}, 40^{o}

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90^{o}, 45^{o}, 45^{o}

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Solution

The correct option is C $120^{o}, 20^{o}, 40^{o}$
Ans- From given angles obtuse angled triangle pair is
$120^{\circ}, 20^{\circ}, 40^{\circ}$
obtuse angle:- Angle greater than $90^{\circ}$ but smaller than $180^{\circ}$

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x

a) {90^{o}, 30^{o}, 50^{o}}

b) {40^{o}, 40^{o}, 100^{o}}

c) {50^{o}, 60^{o}, 70^{o}}

d) {20^{o}, 30^{o}, 40^{o}}

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