Construct a parallelogram ABCD in which cm, cm and the altitude AL from A is 2.5 cm. Draw the altitude from C and measure it.

STEP 1: At first draw a base line of 6.5 cm by scale.

STEP 2: Then draw a line perpendicular to AB from A with the help of protractor.

STEP 3: Then from A draw an arc of radius 2.5 cm on the perpendicular line. That intersecting point is L.

STEP 4: Then from L draw a perpendicular line with respect to AL.

STEP 5: Now from A draw an arc of radius 3.4 cm on the new line perpendicular to AL. That point is C.

STEP 6: From C draw an arc of radius 6.5 cm on the perpendicular line CL. That intersecting point is D.

STEP 7: Join AD and BC.

According to the problem, AL = 2.5 cm which is the altitude from point A. Similarly from point C altitude is CM which is of same length of AL = 2.5 cm.