Prove: is tangent to circle C. Reasons
Statements
Circle Cis constructed so that CD = DE = AD;
Given
is a radius of circle C.
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Definition of congruence
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ACD is an isosceles triangle;
ADE is an isosceles triangle.
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Isosceles triangle theorem

An observer(o) spots a plane(p) taking off from a local airport and flying at a 29 degree angle horizontal to her line of sight and located directly above a tower(t). the observer also notices a bird circling directly above her. if the distance from the plane(p) to the tower(t) is 6,000ft., how far is the bird(b) from the plane(p).