The length of the sides of a triangle are 5cm, 12cmand 13cm.find it's circumradius.

I'm not getting solutions of surface area and volumes starting from q6 . And there no teach me how icon also ! What to do ?

From a point P on the ground the angle of elevation of the top of the a 10m tall building and a helicopter hovering at some height of vertically over the top of the building are 30 degree and 60 degree respectively . Find the height of the helicopter above the ground.

In the figure angle m =angle n =46 degree
,Express x in the terms of a,b and c where a,b and c are lengths of LM,MN and NK respectively .

Draw acircle of radius 3cm.Draw a triangle with angles 50° and 70° with all sides are tangents to circle?

Draw acircle of radius 3cm.Draw a triangle with angles 50° and 70° with all sides are tangents to circle?