In circle p, diameter qs measures 20 centimeters.

what is the approximate length of arc qr? round to the nearest tenth of a centimeter.

9.9 centimeters
19.9 centimeters
21.5 centimeters
43.0 centimeters

Which of the following is true for the relation f(x)=2x^2+1

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?

∆red ≅ ∆ by rule will give brainiest if possible