Write the standard equation of the circle with center (-8, -7) and a radius of 6.5.

Is the orthocenter of a triangle on the inside ?

Solve the system of equations y= 3/2 - 1, -x+ y =-3

In the figure below, ∠dec ≅ ∠dce, ∠b ≅ ∠f, and segment df is congruent to segment bd. point c is the point of intersection between segment ag and segment bd, while point e is the point of intersection between segment ag and segment df. the figure shows a polygon comprised of three triangles, abc, dec, and gfe. prove δabc ≅ δgfe.