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

In DeltaABC with usual notations, if r = 1, r_(1) = 7 and R = 3, " then " DeltaABC is

Classify these triangles as right, acute or obtuse angled triangle.

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

If sinA+sinB+sinC=(3sqrt3)/(2). then: DeltaABC is (a) isosceles (b) right angled (c) equilateral (d) obtuse angled

With usual notation in Delta ABC,(rr_(1))/(r_(2)r_(3)) is equal to

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

In a /_\ABC (with usual notations) if ex-radii r_(1) , r_(2) , r_(3) are in H.P then (a+c)/b is

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

In /_ABC with usual notation,if A=3C and acute angle between altitude from vertex A and angle bisector of vertex B is 60^(@), then