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mandy9386
09.08.2021 •
Mathematics
ABCD is a quadrilateral, P Q R and S divide AB, CB, CD and AD in ratio 1:3 respectively. Prove that a//m. (Please hurry up, I will mark you as Brainliest)
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Ответ:
Two lines are parallel if they are equidistant from one another. The following proves![a || m](/tpl/images/1406/1623/935c7.png)
To prove that
is to prove that side length SR and side length PQ are parallel because:
Considering
, we have: ![BP=3PA](/tpl/images/1406/1623/c14a0.png)
Divide both sides by PA
Similarly:![BQ=3QC](/tpl/images/1406/1623/bba75.png)
Divide both sides by QC
So, we have:
Express as ratios
Thales Theorem states that: A line that divides any two sides of a triangle in the same ratio is parallel to the third side.
The third side of
is
.
This means that:
is parallel to ![AC](/tpl/images/1406/1623/8a0fe.png)
Since
is parallel to
, then
is parallel to ![SR](/tpl/images/1406/1623/4cc52.png)
i.e.![SR || PQ](/tpl/images/1406/1623/c068f.png)
Recall that:
Hence:
Read more about proof of parallel sides at:
Ответ:
1) 38
2) 19
3) 1134
Step-by-step explanation: