LINES AND ANGLES | TYPES OF ANGLES | Acute Angle; Right Angle and Obtuse Angle,

An obtuse angle is

An obtuse angle is

A right triangle cannot have an obtuse angle.

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

Two acute angles of a right triangle are equal. Find the two angles.

Angle of 0^(@) is an acute angle.

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

For a /_\ABC, if cotA.cotB.cotCgt0 , then nature of the triangle is (A) acute angled triangle (B) right angled triangle (C) obtuse angled triangle (D) none of these

OBTUSE TRIANGLE A triangle whose one angle is obtuse is called an obtuse-angled triangle or an obtuse triangle.

In A B C , if r\ : r_1: R=2\ : 12\ :5, where all symbols have their usual meaning, then A B C is an acute angled triangle A B C is an obtuse angled triangle A B C is right angled which is not isosceles A B C is isosceles which is not right angled