12. A diagonal of a quadrilateral is 40 m long and the perpendiculars to it from the opposite corners
are 8 m and 10 m respectively. Find Its area. (Fig.
11.15)​

Thales was an ancient philosopher familiar with similar triangles. one story about him says that he found the height of a pyramid by measuring its shadow and his own shadow at the same time. if the person is 5-ft tall, what is the height of the pyramid in the drawing?

Abird on top of a 200 ft bridge tower sees a man standing on the lower part of the bridge (which is 50 ft above the ground). the angle of depression from the bird is 26 ̊. how far is the man from the base of the bridge tower? with explanation and pictures .

Write the point-slope form of the line passing through (2, -12) and parallel to y=3x.