In `ABC` with usual notations, if `r=1,r_1=7 and R=3,` the `(a) ABC` is equilateral (b) acute angled which is not equilateral (c) obtuse angled (d) right angled

Can a triangle have a, two acute, b. two obtuse, and c. two right angles.

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

If one side of a triangle is double the other, and the angles on opposite sides differ by 60^0, then the triangle is equilateral (b) obtuse angled (c) right angled (d) acute angled

In Delta ABC with usual notation r_1/(bc)+r_2/(ca)+r_3/(ab) is

If one angle of a triangle is equal to the sum of the other two angles, then the triangle is (a) an isosceles triangle (b) an obtuse triangle (c) an equilateral triangle (d) a right triangle

Find the ara of the given obtuse-angled triangle ABC.

If cos^2A+cos^2B+cos^2C=1, t h e n ABC is (a)equilateral (b) isosceles (c)right angled (d) none of these

Match the following :Measures of Triangle Type of Triangle(i) 3 sides of equal length (a) Scalene(ii) 2 sides of equal length (b) Isosceles right angled(iii) All sides are of different length (c) Obtuse angled(iv) 3 acute angles (d) Right angled(v) 1 right angle (e) Equilateral(vi) 1 obtuse angle (f) Acute angled(vii) 1 right angle with two sides of equal length (g) Isosceles

An angle of measure 140^0 is (a)an acute angle (b) an obtuse angle (c)a straight angle (d) a complete angle

In a triangle ABC with usual notation b cosec B=a , then value of (b + c)/(r+ R) is