the area enclosed between the concentrated circle is 770 CM square given that the radius of outer circle is 21 CM calculate the radius of inner circle​

Find the average speed of a rabbit that runs a distance of 22 m in a time of 1.8 s .

In the following diagram it is given that dec, ab || dc, ad || eb, and ad is congruent to bc. a)why isn't abc a parallelogram even though it has a pair of parallel sides and a pair of congruent sides b)explain why be must be congruent to bc. further explain what type of triangle this makes triangle abc and what it tells you about angle 1 and angle 2c) finally why must angle 3 be congruent to angle 1? further, explain why we know that angle 3 is congruent to angle 2

Find the condition that the zeros of the polynomial f(x) = x^3+3px^2+3px+r may be in a. p.