Using only a rular , draw an acute angle, an obtuse angle and a staight angle.

An obtuse angle is

An obtuse angle is

An angle of measure 140^(@) is an acute angle (b) an obtuse angle a straight angle (d) a complete angle

Use a protractor to draw an acute angle, a right angle and an obtuse angle :

Give two measures of (i) acute angle (ii) obtuse angle.

Is the triangle, whose vertices are (5, -6), (1, 2) and (-7, -2) , a right-angled triangle, an acute-angled triangle or an obtuse-angled triangle?

Draw an acute angle POQ and draw its line symmetry.

Naming triangles by considering the measures of their angles acute triangle A triangle whose all the angles are acute is called an acute- angled triangle or an acute triangle.

If in a /_\ABC, sin^2A+sin^2B+sin^2C=2, then /_\ is always a an (A) isosceles triangle (B) right angled triangle (C) acute angled triangle (D) obtuse angled triangle

Let the points A:(0, a), B:(-2, 0) and C:(1, 1) form an obtuse angled triangle (obtuse angled at angle A), then the complete set of values of a is