Across-section of a light reflector is a parabola. the bulb is located at the focus. suppose the bulb is located 11 in from the vertex of the reflector. use this information to make the following determinations. model a cross section of the reflector by writing an equation of a parabola that opens upward and has its vertex at the origin.

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What is the first step of an indirect proof of a number that is divisible by two

Given: abcd is a square. prove: ac ? bd. we are given that abcd is a square. if we consider triangle aeb and triangle aed, we see that side is congruent to side ad because sides of a square are congruent. we know that side ae is congruent to side ae by using the . finally, we know that side de is congruent to side because the diagonals of a square bisect each other. therefore, triangle aeb is congruent to triangle aed by congruency. we see that angle aed and angle aeb are a linear pair, and congruent by cpctc. thus, the measure of these angles will be 90°, and diagonal ac is perpendicular to diagonal bd by the .