Convert the rectangular equation into a polar equation.
a) r= 8cos theta
b) r= sqrt8 cos theta
c) r= 8sin theta
d) r= sqrt8 sin theta

What is the ratio of the length of an object in yards to the length of the same object in miles?

Find the area of the triangle formed by the origin and the points of intersection of parabolas y=−3x^2+20 and y=x^2−16.

Given: ae ≅ ce ; de ≅ be prove: abcd is a parallelogram. we have that ab || dc. by a similar argument used to prove that △aeb ≅ △ced, we can show that △ ≅ △ceb by. so, ∠cad ≅ ∠ by cpctc. therefore, ad || bc by the converse of the theorem. since both pair of opposite sides are parallel, quadrilateral abcd is a parallelogram.