Ef is a median of isosceles trapezoid abcd the length of ab is 12 and the length of cd is 18 what is the length of de

What is the difference between regular convex and concave polygons

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The bottom of ignacio's desktop is 74.5cm from the floor. ignacios sits in his adjustable chair, and the tops of his legs are 49.3cm from the floor. each clockwise rotation of the knob on the chair raises ignacio's legs by 4.8cm. write an inequality to determine the number of clockwise rotations, r, ignacio could make with the knob without his legs touching the desk.