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We know that HK ≅ BC.
15
From the two figures, we see that HK ≅ BC. This means we can equate the expressions of these segments. HK ≅ BC: 8z-9=3z+6Since the equation only contains z as a variable, it can be solved.
LHS-3z=RHS-3z
LHS+9=RHS+9
.LHS /5.=.RHS /5.
When we know that z= 3 we can substitute this into the expression for BC: BC: 3( 3)+6=15