abc

If in a /_\ ABC, sum cos3A=1, then (A) /_\ ABC is a rilght angled triangle (B) /_\ABC is an obtuse angled triangle (C) /_\ABC is an acute angled triangle (D) In radius r of /_\ABC is either sqrt(3)(s+a)or sqrt(3)(s+b) or sqrt(3)(s+c)

The given figure shows a triangle ABC with angle BAC= 56 ^(@) and angle ABC = 64^(@) , Bisectors of angles A,B and C meet the circumcircle of the Delta ABC at points P,Q and R respectively . Find the measure of angle QPR .

The triangle ABC, where A is (2, 6), B is (-3, 5) and C is (4, 7), is reflected in the y-axis to triangle A'B'C'. Triangle A'B'C' is then reflected in the origin to triangle A"B"C''. Write down a single transformation that maps triangle ABC onto triangle A"B"C".

Let the incircle of a Delta ABC touches sides BC, CA and AB at D,E and F, respectively. Let area of Delta ABC be Delta and thatof DEF be Delta' . If a, b and c are side of Detla ABC , then the value of abc(a+b+c)(Delta')/(Delta^(3)) is (a) 1 (b) 2 (c) 3 (d) 4