The length and breadth of a rectangular ground is 30 m and 20 m respectively. A boy moves around the ground 5 times early morning everyday. Find the distance covered by him?​

1. ∠1 is complementary to ∠2 and ∠3 is complementary to ∠2. subtraction property of equality 2. m∠1 + m∠2 = 90 and m∠3 + m∠2 = 90 substitution 3. m∠1 + m∠2 = m∠3 + m∠2 definition of complementary 4. m∠1 = m∠3 given

In the diagram, ab is tangent to c, ab = 4 inches, and ad = 2 inches. find the radius of the circle.

Sole the equation 6n + 9 = -3n - 21 - 6 for n