As indicated by the inquiry,
Abdominal muscle = CD
Development: Produce AB and CD, to converge at P.
Confirmation:
Think about the circle with more noteworthy span.
Digressions drawn from an outside highlight a circle are equivalent
AP = CP … (1)
Too,
Think about the circle with more modest sweep.
Digressions drawn from an outer highlight a circle are equivalent
\[BP\text{ }=\text{ }BD\text{ }\ldots \text{ }\left( 2 \right)\]
Deduct Equation (2) from (1). We Get
\[AP\text{ }\text{ }BP\text{ }=\text{ }CP\text{ }\text{ }BD\]
Abdominal muscle = CD
Thus Proved.