add a line between a and p
the sum of the lengths of any two sides must be greater than the length of the remaining side.
ap<ab+bp
+)ap<ca+pc
----------
2ap<ab+ca+(bp+pc)=ab+ca+bc
Mathematics
Senior High
どなたか解説お願いしたいです😭😭🙏🏻
200 △ABCの辺BC上に頂点と異なる点Pをとる。 2AP <AB+BC + CA であることを証明せ
よ。
AABPI=2412
AP <AB + BP O
△APCにおいて
AP < CA< PC 4
①②の辺々を加えると
B
P
2APCAB+CA+ (BP+PC)
すなわち2AP<AB+BC+CA
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