The distance between the centres of two circles having radii 9 cm and 4 cm is 13 cm What is the leng...........

Quantitative Aptitude (CDS) Coordinate Geometry

The distance between the centres of two circles having radii 9 cm and 4 cm is 13 cm. What is the length of the direct common tangent of these circles?

12 cm

11 cm

10 cm

9.5 cm

छोटे Courses बड़े Results

Master Coordinate Geometry

Prepare through Micro-courses

Try Now

Explanation:

Given that radius of first circle(R) = 9 cm
radius of second circle(r) = 4 cm
Distance between the centers of two circles(d) = 13 cm
The length of the direct common tangent of these circles = √d²−(R−r)²
= √13²−(9−4)² =√169−25 = √144 = 12 cm