The problem is based on similar triangles $\triangle PXY$ and $\triangle PRQ$. We need to: a) Name a correct order for the triangle that is similar to $\triangle PXY$. b) Find the length of $QR$. c) Find the ratio of the area of $\triangle PXY$ to the area of $\triangle PQR$. Given: $PJ=2, JR=4, PX=3, XQ=3$.

GeometrySimilar TrianglesTriangle AreaRatiosGeometric Proofs
2025/3/31

1. Problem Description

The problem is based on similar triangles PXY\triangle PXY and PRQ\triangle PRQ. We need to:
a) Name a correct order for the triangle that is similar to PXY\triangle PXY.
b) Find the length of QRQR.
c) Find the ratio of the area of PXY\triangle PXY to the area of PQR\triangle PQR.
Given: PJ=2,JR=4,PX=3,XQ=3PJ=2, JR=4, PX=3, XQ=3.

2. Solution Steps

a) We are given that PXY\triangle PXY is similar to PRQ\triangle PRQ. Thus, a correct order is PRQ\triangle PRQ.
b) To find the length of QRQR, we can use the similarity of the triangles PXY\triangle PXY and PRQ\triangle PRQ.
We have PJ=2PJ = 2 and JR=4JR = 4, so PR=PJ+JR=2+4=6PR = PJ + JR = 2 + 4 = 6.
We also have PX=3PX = 3 and XQ=3XQ = 3, so PQ=PX+XQ=3+3=6PQ = PX + XQ = 3 + 3 = 6.
Now, since PXYPRQ\triangle PXY \sim \triangle PRQ, we have the following ratios:
PXPQ=PYPR=XYRQ\frac{PX}{PQ} = \frac{PY}{PR} = \frac{XY}{RQ}
From the image, it appears that XYXY is parallel to RQRQ. Then, from the given information, we are given:
PYPR=YXRQ=PXPQ\frac{PY}{PR} = \frac{YX}{RQ} = \frac{PX}{PQ}.
Given PX=3PX = 3 and PQ=6PQ = 6, then PXPQ=36=12\frac{PX}{PQ} = \frac{3}{6} = \frac{1}{2}.
Also, we are given YXRQ=4RQ\frac{YX}{RQ} = \frac{4}{RQ}.
Therefore, 12=4RQ\frac{1}{2} = \frac{4}{RQ}.
RQ=4×2=8RQ = 4 \times 2 = 8.
Hence QR=8QR = 8.
c) To find the ratio of the area of PXY\triangle PXY to the area of PQR\triangle PQR, we can use the property that the ratio of the areas of similar triangles is equal to the square of the ratio of their corresponding sides.
Area(PXY)Area(PQR)=(PXPQ)2=(PYPR)2=(XYQR)2\frac{Area(\triangle PXY)}{Area(\triangle PQR)} = (\frac{PX}{PQ})^2 = (\frac{PY}{PR})^2 = (\frac{XY}{QR})^2
Since PXPQ=36=12\frac{PX}{PQ} = \frac{3}{6} = \frac{1}{2}, then
Area(PXY)Area(PQR)=(12)2=14\frac{Area(\triangle PXY)}{Area(\triangle PQR)} = (\frac{1}{2})^2 = \frac{1}{4}.

3. Final Answer

a) PRQ\triangle PRQ
b) QR=8QR = 8
c) Area(PXY)Area(PQR)=14\frac{Area(\triangle PXY)}{Area(\triangle PQR)} = \frac{1}{4}

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