What is the area of a circle with a diameter of 16? a. 8πb. 16πc. 64πd. 128πe. 256π

Ineed with number 17 i don’t get it at alll

Kayla wants to find the width, ab, of a river. she walks along the edge of the river 65 ft and marks point c. then she walks 25 ft further and marks point d. she turns 90° and walks until her location, point a, and point c are collinear. she marks point e at this location, as shown. (a) can kayla conclude that δ and δ are similar? why or why not? (b) suppose de = 15 ft. what can kayla conclude about the width of the river?

Find the solution(s) to the system of equations. select all that apply y=x^2-1 y=2x-2