The relation $\dfrac{PM}{OP} = \dfrac{P_1 M_1}{OP_1}$ expresses—

Question

Accepted Answer

constancy of trigonometric ratios

Answer

similarity of triangles only

Answer

the Pythagorean theorem

Answer

a complementary identity

The relation PMOP=P1M1OP1\dfrac{PM}{OP} = \dfrac{P_1 M_1}{OP_1}OPPM​=OP1​P1​M1​​ expresses—