Question

Draw a rough figure using a scale and a pencil where ever required.
Q1 An exterior angle of a triangle DEF is of measure 70° and one of its interior opposite angles is of measure 25° .Find the measure of the other interior opposite angle.
Q2 The two interior opposite angles of an exterior angle of a triangle LMN are 60° and ao0 .Find the measure of the exterior angle.
Q3 Two angles of a triangle XYZ are 30° and ao0 .Find the third angle.
Q4 One of the angles of a triangle PQR is ao0 and the other two angles are equal .Find the measure of each of the equal angles.

Q4 The three angles of a triangle ABC are in the ratio 1:2:1.Find all the angles of the triangle .Classify the triangle in two different ways.

05 Complete the sentence

(a)A triangle cannot have more than _ _ _ _ _ right angle.

(b) A triangle cannot have more than _ _ _ obtuse angle.

(c)A triangle can have _ _obtuse angle and _ _ _ _acute angles.

(d)A triangle can have _ _ _ _ _ right angle and acute angles. The sum of the acute angles should be _ _ _ _

Q6 If all the three angle of a triangle LMN are equal then find the measure of each angle.

Q7 One of the acute angles of a right angled triangle is 35°. Find the measure of the other acute angle of the triangle.

QB Two angles of a triangle are equal and its third angle is double of the equal angle. Find the measures of the three angles of the triangle .

Q9 If one angle of a triangle is 100°and the other angles are in the ratio of 2:3, find the angles .

Q1 O Which of the following triplets can be the angles of a triangle
(a)ao0 ,73° ,27° (b)9o0 ,ao0,3o0 (c) 57° ,61° , 62° (d)30°,142°,20°
Q11 Give reason
(a)A triangle cannot have each angle greater than 60°.

(b) A triangle can have each angle equal to 60°.

(c) A triangle cannot have each angle less than 60°.

Answer 1

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