4
1. В сплаве, масса которого 10кг, содержится
5
никеля и в равных количествах
четыр...
![Mathematics](/tpl/images/cats/mat.png)
Mathematics, 04.03.2021 17:50, zriggi2528
4
1. В сплаве, масса которого 10кг, содержится
5
никеля и в равных количествах
четыре других металла, среди которых есть железо. Сколько железа содержится в
сплаве?
2 В Be cepeána
массой 210г серебро
Me
![answer](/tpl/images/cats/otvet.png)
Answers: 1
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Mathematics, 22.06.2019 02:30, helpmegraduate40
Given: ab ≅ cd and ad ≅ bc prove: abcd is a parallelogram. statements reasons 1. ab ≅ cd; ad ≅ bc 1. given 2. ac ≅ ac 2. reflexive property 3. △adc ≅ △cba 3. ? 4. ∠dac ≅ ∠bca; ∠acd ≅ ∠cab 4. cpctc 5. ∠dac and ∠bca are alt. int. ∠s; ∠acd and ∠cab are alt. int. ∠s 5. definition of alternate interior angles 6. ab ∥ cd; ad ∥ bc 6. converse of the alternate interior angles theorem 7. abcd is a parallelogram 7. definition of parallelogram what is the missing reason in step 3? triangle angle sum theorem sas congruency theorem sss congruency theorem cpctc
Answers: 1
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