Let ∠1, ∠2, ∠3, and ∠4 have the following relationships. ∠1 and ∠2 are obtuse vertical angles.
∠3 is an acute angle adjacent to both ∠1 and ∠2.
∠3 and ∠4 are acute vertical angles.
What is the sum of the measure of ∠2 and the measure of ∠4?

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Which statements about these triangles is true

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?

What statement is true? 2x^2-9x+2=-1