Acute Angle; Right Angle and Obtuse Angle

If the sines of the angles A and B of a triangle ABC satisfy the equation c^2x^2-c(a+b)x+a b=0 , then the triangle a)acute angled b)right angled c)obtuse angled d) sinA+cosA = ((a+b))/c

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

Using only a ruler, draw an acute angle, a right angle and an obtuse angle in your notebook and name them.

Point P is on the circle. AB is diameter of the circle, /_APB is …………….a) a Reflex angle b) an acute angle c) a Right angle d) an obtuse angle

Identify the following triangles as equilateral, isosceles, scalene, acute-angled, right-angled, and obtuse-angled triangles.

If in a triangle ABC, tanA+tanB+tanC>0 the triangle is (A) acute angled triangle (B) obtuse angled (C) right angled (D) none of these