Q2 of 69 Page 9

Write the sum of the angles of an obtuse triangle.

A triangle where one of the internal angles is obtuse (greater than 90 degrees) is called an obtuse triangle. The sum of angles of obtuse triangle is also 180°.


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14

Fill in the blanks to make the following statements true :

(i) Sum of the angles of a triangle is ……


(ii) An exterior angle of a triangle is equal to the two …… opposite angles.


(iii) An exterior angle of a triangle is always …..than either of the interior opposite angles.


(iv) A triangle cannot have more than ….right angles.


(v) A triangles cannot have more than ….. obtuse angles.

 1

Define a triangle.

 3

In Δ ABC, if ∠B = 60°, ∠C = 80° and the bisectors of angles ∠ABC and ∠ACB meet at a point O, then find the measure of ∠BOC.

 14

If the angles of a triangle are in the ratio 2: 1: 3, then find the measure of smallest angle.