Question

If two circles od radii8cm and 3cm have a diry common tangent Of length 10cm ,then the distance between their centre is (√5=2.236)

Answer 1

$\sqrt{ {10}^{2} - {(8 - 3)}^{2} } \\ = \sqrt{100 - {5}^{2} } \\ = \sqrt{100 - 25} \\ = \sqrt{75} \\ =5 \sqrt{3}$