What is the area of a circle with a diameter of 18mm in terms of pi

Which of the following is a justification used while proving the similarity of triangles lom and mon

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?