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Interesting....
If you study the Circle Theorems, you will understand right away that angle BAT is 90 degrees. Reason? Because the Diameter of a circle subtends an angle of 90 degrees to the Circumference (for any circle....Thus Diameter BT Subtends an angle (angle BAT) to the Circumference which is 90 degrees.
LennonMaths
younglennon 2 years ago