The secant, AD intersects the circle at E and AB is the tangent to circle at B. If length of secant AD is equal to 20 cm and length of tangent, AB is equal to 8 cm, find the length of chord DE.
1
16.8 cm
2
12.0 cm
3
13.4 cm
4
10.6 cm
The secant, AD intersects the circle at E and AB is the tangent to circle at B. If length of secant AD is equal to 20 cm and length of tangent, AB is equal to 8 cm, find the length of chord DE.