Here's the question you clicked on:
cwrw238
Find the radius of the enclosed circle. Sides PR and QS are both 25 cms long . All sides of the trapezium are tangents to the circle and area of the trapezium = 600 cm^2. I'm embarrassed to say I have a mental block with this question though I think the answer is 12 cms.
@cwrw238 you are right the radius measures 12 cm.