Geimetric sequences - 13122, 4374, 1458...​

7. if the value of x varies directly with the value of y, and x = 3 when y = 21. what is the valu y, and x = 3 when y = 21. what is the value of x when y = 105?

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

Geometry in the diagram, ∠abc is a right angle. ∠dbc = 30°27'40". find the measure of ∠abd.