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Rihanna wants to find the distance, AB, across a river. She starts at point B and walks along the edge of the river 215 ft and marks point C. Then she walks 25 ft further and marks point D. She turns 85° and walks until her final location and marks point E. Point E, point A, and point C are collinear.

PLEASE HELP Rihanna wants to find the distance AB across a river She starts at point B and walks along the edge of the river 215 ft and marks point C Then she w class=

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abidemiokin

The congruence theorem used is the SAS theorem and the measure of the side AB is 525feet

Congruence theorem

The congruence  theorem used is expressed is the SAS rule which states that:

If two sides and the included angle of one triangle are equal to two sides and included angle of another triangle, then the triangles are congruent.

To get the length of DE, we will use the similarity theorem of the triangle as shown:

DE/25 = AB/215

105/25 = AB/125

25AB = 105 * 125

AB = 105 * 5

AB = 525feet

Hence the measure of the side AB is 525feet

Learn more on congruence theorem here: https://brainly.com/question/2102943

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