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Look at this diagram:
What value of
x
guarantees these triangles are similar?
x
ref_doc_title.

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Work it out
Not feeling ready yet? These can help:
Skill IconP.6Transversals of parallel lines: find angle measures
Skill IconQ.7Find missing angles in triangles
Skill IconQ.9Triangle Angle-Sum Theorem
Skill IconQ.12Exterior Angle Theorem
Skill IconS.6Angle-angle criterion for similar triangles