lillianmacboyer
lillianmacboyer lillianmacboyer
  • 19-02-2018
  • Mathematics
contestada

AB is tangent to circle C. Find the radius r.

AB is tangent to circle C Find the radius r class=

Respuesta :

jcherry99
jcherry99 jcherry99
  • 23-02-2018
What a neat little problem
a^2 + b^2 = c^2
a = r
b = 15
c = r + 9

r^2 + 15^2= (r + 9)^2
r^2 + 225 = r^2 + 18r + 81 the r^2 cancel out
225 = 18r + 81 subtract 81 from both sides
144 = 18r divide by 18
144/18 = r
8 = r
Answer Link

Otras preguntas

help quick no bots!!
What is the slope of the line through (-1, 2) and (-3,-2)? -5 4 (-1.2) 2 14 1 43 2 - 1 1 2 3 4 -1 2 ((-3.2) 3 A. -2 B. C. 2 D. -
in the sequence 13, 27, 41, 55, what is the next number?
Please any math expert multiply this will make you brainliest thank you
skeletal muscle cells are grouped into bundles called
Find the value of MN if AB = 9 cm, BC = 7.2 cm, and LM = 12 cm.
opposite reciprocal of -9/1 and 11/-7
Which point on the number line represents the value of the expression 2 – 6?
In which of Oceania’s ecosystems can you find tree kangaroos, frogs, various birds, ferns, and tall, dense trees? A. the desert B. the tropical grassland C. the
a tectonic plate consists of....