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Find the value of x that will make l ll m

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

If two angles of a triangle have equal measures and the third angle measures 90°, what are the angle measures of the triangle? a. 60°, 60°, 60° b. 45°, 90°, 90° c. 30°, 30°, 90° d. 45°, 45°, 90°