Hihi , please help if able.
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the larger triangle has angles of 75° and 55°.
the smaller triangle has angles of 75° and 55°.
the triangles are similar by AA.
225 serves because you need to set up a proportion. The proportion is 2/5=90/x then solve for x by cross multiplying, which gives you 450=2x. Then divide 450 by 2 which gives you 225. Work shown in the attached picture.
