## K.Binks one year ago Find angle A if DE is equal to 66 degrees and BC is equal to 23 degrees.

1. K.Binks

2. ikram002p

|dw:1438614978271:dw|

3. K.Binks

But how do I solve for A?

4. anonymous

sorry, the angle DCE is 33°, CDB is 23°/2, show the triangle ACD

5. anonymous

the relation, DCE (external) is CDB + A

6. ikram002p

use this formula :- |AE| |CE|=|AD| |BD|

7. phi

angle A is 1/2 the difference between the two intercepted arcs. in other words $\angle A= \frac{1}{2}( \widehat{DE}- \widehat{BC})$

8. anonymous

9. K.Binks

A=4?