Thales, an ancient greek mathematician and philosopher, used certain triangles to find the height of unknown objects. he waited for the time of day when the shadow of a meter stick was exactly one meter long. at this exact moment, thales said the height of the unknown object would also be the same as the length of its shadow. what type of triangle was he using? explain why this theory works.

Vikram is studying the square pyramid below. on st to find the surface area of the pyramid, in square inches, vikram wrote (33.2) (34 ikram wrote (33.2)(34.2)+43(34.2)(284) what error did vikram make? o he used the same expression for the area of all four lateral faces. he used the wrong expression to represent the area of the base of the pyramid. o he used the wrong value as the height when he found the area of the lateral faces. he used an expression for surface area that only finds the total area of three faces.