Find the answer to the penultimate question in Chapter 18 of Mathematics in the second volume of Grade 8 ~ ~ - Training Enrollment Network

Find the answer to the penultimate question in Chapter 18 of Mathematics in the second volume of Grade 8 ~ ~

Prove triangle similarity

CD*CD=AD*BD

So AD/CD=CD/BD

Because the angle is right

Therefore, the triangular ADC CDB is similar to this.

Angle ACD=CBD

Angle ACD+BCD=CBD+BCD=90 degrees.

So I got the title certificate.

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