The perimeter of triangle abc is a. 51 b. 55 c. 60 d. 68

ΔADB is a right triangle at ∠D

So, AB ⇒ Hypotenuse & AD,DB ⇒ Legs

∴

ΔADC is a right triangle at ∠D

So, AC ⇒ Hypotenuse & AD,DC ⇒ Legs

∴ BC= BD+ DC = 16 + 9 = 25

∴ The perimeter of triangle ABC = AB + BC + CA = 20 + 25 + 15 = 60.

So, The correct answer is option  C. 60

step-by-step explanation:

to find if any function is an inverse of the other, put the first equation in as x in the next one. then simplify and solve. if at the end you get the statement y = x, then it is an inverse. if you get anything else, it is not.