Answer as a each as an algebraic expression.

How do i do this activity, is appreciated

The midpoints of the sides of the large square are joined to form a smaller square. what is the area of the smaller square

Look at the figure below: triangle abc is a right triangle with angle abc equal to 90 degrees. the length of ac is 5 units and the length of ab is 4 units. d is a point above c. triangle adc is a right triangle with angle dac equal to 90 degrees and dc parallel to ab. what is the length, in units, of segment cd?