Basic Proportionality Theorem
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14 سال پیش
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Basic Proportionality TheoremIf a line
Basic Proportionality Theorem
If a line is drawn parallel to one side of a triangle and it intersects the other two sides at two distinct points then it divides the two sides in the same ratio.
Figure 5.4
Figure 5.4 shows triangle PQR with line l paralled to seg.QR. l intersects seg.PQ and seg.PR at S and T respectively.
To prove that
Join S to R and Q to T
Consider D PTS and D QTS
Areas of triangles with same height are in the ratio of their bases.
Similarly
But A ( DQTS ) = A ( D SRT ) as they have a common base seg.ST and their heights are same as they are between parallel lines.
Thus the line l which is parallel to seg.QR divides seg.PQ and seg.PR in the same ratio.
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If a line is drawn parallel to one side of a triangle and it intersects the other two sides at two distinct points then it divides the two sides in the same ratio.
Figure 5.4
Figure 5.4 shows triangle PQR with line l paralled to seg.QR. l intersects seg.PQ and seg.PR at S and T respectively.
To prove that
Join S to R and Q to T
Consider D PTS and D QTS
Areas of triangles with same height are in the ratio of their bases.
Similarly
But A ( DQTS ) = A ( D SRT ) as they have a common base seg.ST and their heights are same as they are between parallel lines.
Thus the line l which is parallel to seg.QR divides seg.PQ and seg.PR in the same ratio.
Checkout for more information: https://math.tutorvista.com/geometry/...
Follow us at:
Facebook: tutorvista
Twitter: TutorVista
14 سال پیش
در تاریخ 1389/02/06 منتشر شده
است.
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