B₁ is a point on the side AC of Δ ABC and B₁B is joined. A line is drawn through A parallel to B₁B meeting BC at A₁ and another line is drawn through C parallel to B₁B meeting AB produced at C₁. Then

O is the circumcentre of the isosceles ΔABC. Given that AB=AC=17 cm and BC = 6cm. The radius of the circle is 

If D and E are the mid points of AB and AC respectively of  Δ ABC, then the ratio of the areas of ADE and BCED IS

ABC is an isosceles triangle where AB = AC which is circumscribed about a circle. If P is the point where the circle touches the side BC, then which of the following is true

ABC is an isosceles triangle inscribed in a circle. If AB = AC = 12√5 and  BC = 24 cm then radius of circle is                     

A and B are the centres of two circles with radii 11 cm and 6 cm respectively. A common tangent touches these circles at P & Q respectively. If AB = 13 cm, then the length of PQ is