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Svetradugi [14.3K]
3 years ago
12

Rex, Paulo, and Ben are standing on shore watching for dolphins. Paulo sees one surface directly in front of him about a hundred

feet away. Use the spaces provided below to prove that the square of the distance between rex and Ben and the dolphin, and Ben and the dolphin.
URGENT !! I NEED TO PASS THIS TO GRADUATE !!

Mathematics
2 answers:
Ksivusya [100]3 years ago
7 0

1. m\angle BAC=m\angle CAD,\ m\angle ACB=m\angle ADC=90^{\circ}, then m\angle ABC=m\angle ACD and triangles ADC and ACB are similar by AAA theorem.


2. The ratio of the corresponding sides of similar triangles is constant, so


\dfrac{AC}{AB}= \dfrac{AD}{AC}.


3. Knowing lengths you could state that \dfrac{b}{c}= \dfrac{e}{b}.


4. This ratio is equivalent to b^2=ce.


5. m\angle ABC=m\angle CBD,\ m\angle ACB=m\angle CDB=90^{\circ}, then m\angle BAC=m\angle BCD and triangles BDC and BCA are similar by AAA theorem.


6. The ratio of the corresponding sides of similar triangles is constant, so


\dfrac{BC}{BD}= \dfrac{AB}{BC}.


7. Knowing lengths you could state that \dfrac{a}{d}= \dfrac{c}{a}.


8. This ratio is equivalent to a^2=cd.


9. Now add results of parts 4 and 8:


b^2+a^2=ce+cd.


10. c is common factor, then:


b^2+a^2=c(e+d).


11. Since e+d=c you have a^2+b^2=c\cdot c=c^2.



erastova [34]3 years ago
4 0

Answer:

Given information: \triangle ADC\sim \triangle ACB and \triangle BDC\sim \triangle BCA.

To Prove : a^2+b^2=c^2

Proof:

   Statement                                               Proof

1. \triangle ADC\sim \triangle ACB                              1. Given

2. \dfrac{AC}{AB}=\dfrac{AD}{AC}                                     2. The ratio of corresponding parts of similar triangles is a constant

3. \dfrac{b}{c}=\dfrac{e}{b}                                           3. Rewrite statement 2 using given side labels.

4. b^2=ce                                           4. Cross multiply statement 4

5. \triangle BDC\sim \triangle BCA                         5. Given

6.  \dfrac{BC}{BA}=\dfrac{BD}{BC}                                   6. The ratio of corresponding parts of similar triangles is a constant

7. \dfrac{a}{c}=\dfrac{d}{a}                                            7. Rewrite statement 5 using given side labels.

8. a^2=cd                                            8. Cross multiply statement 7

9. a^2+b^2=cd+ce                        9. Add statement 4 and 8

10. a^2+b^2=c(d+e)                        10. c is common factor

11. a^2+b^2=c^2                                11. Segment addition property.

Hence proved.

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