A triangular pyramid has lateral faces with bases of 6 meters and heights of 10 meters. The area of the base of the pyramid is 15.6 square meters. What is the surface area of the pyramid?

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Circle d circumscribes abc and abe. which statements about the triangles are true? statement i: the perpendicular bisectors of abc intersect at the same point as those of abe. statement ii: the distance from c to d is the same as the distance from d to e. statement iii: bisects cde. statement iv: the angle bisectors of abc intersect at the same point as those of abe. a. i only b. i and ii c. ii and iv d. i and iii e. iii and iv

Which two undefined geometric terms always describe figures with no beginning or end?