If three circle touch externally then the perimeter of a triangle formed by joining the center is equal to the…………of their diameter.
a) difference
b) sum
c) multiplication
d) division
Perimeter of a triangle is equal to
a) d1+d2
b) d1+d2+d3
c) d1-d2
d) d1-d2-d3
A line which has two point in common with a circle is called
a) sine of a circle
b) cosine of a circle
c) tangent of a circle
d) secant of a circle
