Evaluate sin² 19^o+ sin² 71^o?

x/4 x/6=x-7

In triangle ABC, D, E and F are midpoints of AB, AC and BC respectively . Prove that AF and DE bisect each other.

Three cubes of sides 3cm , 4cm and 5cm respectively are melted to form a new cube .What is the side of new cube?

Construct a ABC with BC=6.2 CM,  AB=5.4cm and AC=3.5cm

Draw a quardlateral whose vertices are  (-4,4), (-4,2),(0,-4) and  (-2,-4) and also find its area

Find the volume of the largest right circular cone that can be cut out of a cube whose edge is 7 cm

1. How we solve it properly