Angle a and b are complementary angles. If a=3x + 9 and b= x-11, find the measure of A.

The volume of a sphere is increased by 6%. calculate the corresponding percentage increased in it area.

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.

How many terms does the polynomial x^2 y^2 have