+0  
 
-4
1036
1
avatar+73 

Line BD is tangent to a circle with diameter AB. Can some please explain this because I'm very confused...

 May 8, 2020
 #1
avatar
+1

A point of tangent forms a 90o angle with the radius or diameter to that point.

An inscribed angle's measure is 1/2 of the arc it intercepts  BCA intercepts an arc of 180o   so BCA is 90o  too.

 May 8, 2020

2 Online Users