The length of common internal tangent to two circles is 7 and that of a common external tangent is 11. Then the product of the radii of the two circles is

If the length of a common internal tangent to two circles is 7, and that of a common external tangent is 11, then the product of the radii of the two circles is (A) 36 (B) 9 (C) 18 (D) 4

If the length of a common internal tangent to two circles is 7, and that of a common external tangent is 11, then the product of the radii of the two circles is (A) 36 (B) 9 (C) 18 (D) 4

If the length of a common internal tangent to two circles is 7, and that of a common external tangent is 11, then the product of the radii of the two circles is (A) 36 (B) 9 (C) 18 (D) 4

If the length of a common internal tangent to two circles is 7, and that of a common external tangent is 11, then the product of the radii of the two circles is (A) 36 (B) 9 (C) 18 (D) 4

The length of a common internal tangent to two circles is 5 and that of a common external tangent is 13. If the product of the radii of two circles is lamda , then the value of (lamda)/(4) is

The length of a common internal tangent to two circles is 5 and that of a common external tangent is 13. If the product of the radii of two circles is lamda , then the value of (lamda)/(4) is

The length of a common internal tangent to two circles is 5 and a common external tangent is 15, then the product of the radii of the two circles is :

The length of a common internal tangent to two circles is 5 and a common external tangent is 15, then the product of the radii of the two circles is :

Common tangent to two circles

Two circles touch each other externally. Prove that the lengths of the tangent drawn to the two circles from any point on the common tangent lie at the point of contact of two circles are equal .