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ArbitrLikvidat [17]
3 years ago
8

Hurryy pleaseeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

Mathematics
1 answer:
NISA [10]3 years ago
5 0
The answer is answer 3
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Experimentally verify sum of three angles of an triangle is 180⁰.​
svetlana [45]

Draw line a through points A and B. Draw line b through point C and parallel to line a.

Since lines a and b are parallel, <)BAC = <)B'CA and <)ABC = <)BCA'.

It is obvious that <)B'CA + <)ACB + <)BCA' = 180 degrees.

Thus <)ABC + <)BCA + <)CAB = 180 degrees.

Lemma

If ABCD is a quadrilateral and <)CAB = <)DCA then AB and DC are parallel.

Proof

Assume to the contrary that AB and DC are not parallel.

Draw a line trough A and B and draw a line trough D and C.

These lines are not parallel so they cross at one point. Call this point E.

Notice that <)AEC is greater than 0.

Since <)CAB = <)DCA, <)CAE + <)ACE = 180 degrees.

Hence <)AEC + <)CAE + <)ACE is greater than 180 degrees.

Contradiction. This completes the proof.

Definition

Two Triangles ABC and A'B'C' are congruent if and only if

|AB| = |A'B'|, |AC| = |A'C'|, |BC| = |B'C'| and,

<)ABC = <)A'B'C', <)BCA = <)B'C'A', <)CAB = <)C'A'B'.

4 0
2 years ago
Can u explain to me how to get the answer??
crimeas [40]
Basically all you have to do is to find what the question is telling you and the unit you will get it from the question example: 15 is what percent of 90 so first work out the question then the unit is percent% because they say what percent.
 
hope i helped
7 0
3 years ago
Read 2 more answers
Sonji paid $25 for two scarves, which were different prices. When she got home she could not find the receipt. She remembered th
Oksanka [162]

Answer:

$14

Step-by-step explanation:

Make the variables:

x

x + 3

2x + 3 = 25

2x = 22

x = 11

11, 14

5 0
3 years ago
Read 2 more answers
I need help please ​
Zina [86]

Answer:

Its out of A and C srry couldn't help much

8 0
3 years ago
Solve 7.8+3.5w-1.5 for w = 6.8 using PEMDAS
VikaD [51]
7.8+3.5(6.8)-1.5
7.8+23.8-1.5
31.6-1.5
30.1
5 0
3 years ago
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