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chapter7.5b
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à 7.5ïSolving Similar Triangles
äïPlease find the indicated side of the following similar
êêtriangles.
âSèSolve for "x" in the given similar triangles.
êêê6ë x
#êêê─ï=ï──ë6 ∙ 24 = 8 ∙ xè 144 = 8x
êêê8ë24êêêï18 in. = x
êêêêë The unknown side is equal to 18 in.
@fig501.bmp,25,118
éS
Two triangles are similar if they have the same shape but not necessar-
ily the same size.ïThis means that corresponding angles are equal, but
corresponding sides might be of different lengths.ïOne thing that is
true about Similar Triangles is that "ratios of corresponding sides are
proportional".ïThis means we can set up a proportion to find the unknown
side.ïIn our example, we can set up a proportion involving correspond-
ing sides.
êêë 6 in.è xëThe proportion can beë 6∙24 = 8∙x
#êêë ──── = ────è solved to find the miss-è 144 = 8x
êêë 8 in.è24 in. ing side, "x".êë18 in. = x
êêë Thus, the missing side is x = 18 in.
@fig502.bmp,0,170
1ê Solve for "x" in the given Similar Triangles.
êêêêè A)ï24êêèB)ï20
êêêêè C)ï22êêèD)ïå
@fig503.bmp,25,229
ü
êë 12ë18
#êë ──ï=ï──ë 12x = (16)(18)ë 12x = 288
êë 16ë xêêêêx = 24
Ç A
2ê Solve for "x" in the given Similar Triangles.
êêêêè A)ï6êêè B)ï10
êêêêè C)ï8êêè D)ïå
@fig504.bmp,25,229
ü
êê2ë 4
#êê─ï=ï──ë (2)(12) = 4∙xê 24 = 4x
êêxë12êêêê6 = x
Ç A
3ê Solve for "x" in the given Similar Triangles.
êêêêè A)ï4.5êêïB)ï5.76
êêêêè C)ï6êêè D)ïå
@fig505.bmp,25,229
ü
êê4ë8
#êê─ï=ï─ê 4x = (3)(8)êï4x = 24
êê3ëxêêêê x = 6
Ç C
4ê Solve for "x" in the given Similar Triangles.
êêë (round to the nearest hundredth)
êêêêè A)ï10 in.êêB)ï12.2 in.
êêêêè C)ï9.6 in.êë D)ïå
@fig506.bmp,25,229
ü
êê4ë6.4
#êê─ï=ï───ë 4x = (6)(6.4)ê4x = 38.4
êê6ë xêêêêx = 9.6 in.
Ç C
5ê Solve for "x" in the given Similar Triangles.
êêêêè A)ï38 in.êêB)ï39.6 in.
êêêêè C)ï36 in.êêD)ïå
@fig507.bmp,25,229
ü
êë 10ë22
#êë ──ï=ï──ë 10x = (18)(22)ë 10x = 396
êë 18ë xêêêêx = 39.6
Ç B
6ê Solve for "x" in the given Similar Triangles.
êêë (round answer to the nearest hundredth)
êêêêè A)ï26êêèB)ï28
êêêêè C)ï24êêèD)ïå
@fig508.bmp,25,229
ü
êè 2 ft.ë8 ft.
#êè ────ï=è────ë2x = (6)(8)êè2x = 48
êè 6 ft.ëx ft.êêêëx = 24
Ç C
7ê Solve for "x" in the given Similar Triangles.
êêë (round answer to the nearest hundredth)
êêêêè A)ï6.2 cm.êë B)ï6.32 cm.
êêêêè C)ï5.41 cm.êëD)ïå
@fig509.bmp,25,229
ü
êè2.3 cmë6.8 cm
#êè──────ï=ï──────ë2.3(16) = 6.8xè 36.8x = 6.8x
êè5.41 cmè 16 cmêêêè5.41 cm. ≈ x
Ç C
8ê Solve for "x" in the given Similar Triangles.
êêë (round answer to the nearest hundredth)
êêêêè A)ï17.74 m.êëB)ï16.28 m.
êêêêè C)ï15.3 m.êë D)ïå
@fig510.bmp,25,229
ü
êë2.3ë x
#êë───ï=ï──ë (2.3)(27) = 3.5xë 62.1 = 3.5x
êë3.5ë27êêêê17.74 m. = x
Ç A
9ê Solve for "x" in the given Similar Triangles.
êêë (round answer to the nearest hundredth)
êêêêè A)ï4.1êêïB)ï3.79
êêêêè C)ï5.23êê D)ïå
@fig511.bmp,25,229
ü
êë xë 64
#êè ────ï=ï──ë 42x = (2.49)(64)è 42x = 159.36
êè 2.49ë42êêêêx = 3.79
Ç B
10êSolve for "x" in the given Similar Triangles.
êêêêè A)ï50êêèB)ï32
êêêêè C)ï28êêèD)ïå
@fig512.bmp,25,229
ü
êê2ë25
#êê─ï=ï──ê 2x = 4∙25êè2x = 100
êê4ë xêêêêx = 50
Ç A