21. In the figure below, CDB, DBA, and CAD are all isosceles triangles and the length of segment BC is 4 ft. Determine the value of a in ft. D a a 4 ft a B A) 6.47 B) 6.06 C) 5.87 D) 6.25

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A: Since you have asked multiple question, we will solve the first 3 question for you as per our guide…

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A: It can be found by pyhthoras theorem.as it is a right angle triangle

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A: (a) The given triangle is right angled triangle therefore we can apply the Pythagoras theorem.…

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A: We have to find the measure of side c to the nearest hundredth. Please see the explanation below.

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A: in any triangle line opposite to the largest interior angle is the longest line

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A: Here we have to prove that given triangles are similar and do the next step

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A: Drawing the given triangle with measure of sides, we get a figure

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A: We have to find the value of x.

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A: Given side lengths = 7 cm,15 cm,7 cm