What is the value of r/R in an equilateral triangle .

In an equilateral triangle r:R:r1 is

In an equilateral triangle r:R:r_1 is

If arcs of radius r cm are drawn with the vertices of an equilateral triangle ABC as shown in the figure, then the area of the shaded region is

Find the potential energy of a system of 3 particles kept at the vertices of an equilateral triangle of side r.

If the length of side of an equilateral triangle is 10cm , then R =

The perimeter of an equilateral triangle is 168 m. What is the length of the side of the equilateral triangle ?

In the given figure,ABC is an equilateral triangle; PQ|AC and AC is produced to R such that CR=BP. Prove that QR bisects PC

Show that the points (p , q , r) , (q , r , p) and (r , p , q) are the vertices of an equilateral triangle.

P,Q,S and R are points on the circumference of a circle of radius r ,such that POR is an equilateral triangle and PS is a diameter of the circle.What is the perimeter of the quadrilateral PQSR?

P, Q, R and S are the points on the circumference of a circle of radius r, such that PQR is an equilateral triangle and PS is a diameter of circle. What is the perimeter of the quadrilateral PQSR?