Let `h_(A),h_(B),h_(C)` be the altitudes of triangle `ABC` from vertices `A,B,C` respectively. With usual notations,`(1/h_(A))cos A+(1/h_(B))cos B+(1/h_(C))cosC=`

In Delta ABC with usual notation, (c-b cos A)/(a) is equal to

Let A-=(-2,0),B-=(4,0),C-=(h,h) . If perimeter of triangle ABC is minimum,then

In a Delta ABC with usual notations, if (a)/(cos A)=(b)/(cos B)=(c )/(cos C) , then the triangle is :

If in a Delta ABC, the altitudes from the vertices A,B,C on opposite sides are in H.P.then sin Asin B, sin C are in

A ball moves over a fixed track as shown in thre figure. From A to B the ball rolls without slipping. If surface BC is frictionless and K_(A),K_(B) and K_(C) are kinetic energies of the ball at A, B and C respectively then (a). h_(A)gth_(C),K_(B)gtK_(C) (b). h_(A)gth_(C),K_(C)gtK_(A) (c). h_(A)=h_(C),K_(B)=K_(C) (d). h_(A)lth_(C),K_(B)gtK_(C)

" Let "A-=(-2,0),B-=(4,0),C-=(h,h)" .If perimeter of triangle "ABC" is minimum,then "

Let f, g and h be the lengths of the perpendiculars from the circumcenter of Delta ABC on the sides a, b, and c, respectively. Prove that (a)/(f) + (b)/(g) + (c)/(h) = (1)/(4) (abc)/(fgh)

If in a !ABC , the altitudes from the vertices A , B , C on the opposite sides are in H.P., then sin A, sin B , sin C are in

With usual notations,in a triangle ABC,acos(B-C)+b cos(C-A)+c cos(A-B) is equal to

Let f,g,h be the lengths of the perpendiculars from the circumcenter of the Delta ABC on the sides BC,CA and AB respectively.If (a)/(f)+(b)/(g)+(c)/(h)=lambda(abc)/(fgh), then the value of 'lambda' is (B) (1)/(2) (B) (1)/(2) (D) (1)/(2) (D) 2