Question

Find the length of DA

Answer 1

2.5

Explanation:

1. intersecting chord theorem

2. Let where CB and DA intersect be X

3. CX * XB = DX * XA

4. 7*x = (x+1) * 2x

5. 7x = 2x^2 + 2x

6. 2x^2 - 5x = 0

7. x = 2.5 or 0

8. length cant be 0 so x = 2.5