to make sure that a given parallelogram is a rectangle, at least how many of
its angles must measure 90°?

a. three
b. one
c. two
d. four

answer: ef and ed ,cb and cd

step-by-step explanation:

in the given figure a circle is inscribed inside in a triangle .

the sides of the triangle are touching the circle at particular points.

also we know that a line that touches the circle at one point is called tangent.

the tangent theorem says that tangents drawn from an external point are equal.

so from the given options the congruent line segments are :