2 circles of radius 3 cm each is constructed such that centre of each touches the circumference of other as shown below.
AC1C2 is a/an
Since the radius of the circle is the same, we have
AC2=AC1=r
C1 C2 is also equal to radius of the circle.
Hence, AC1=AC2=C1 C2=r
∴The triangle formed is an equilateral triangle.