16, 24, 32, 40, 48, 56, 64, 72, etc.
Use Pythagorean Theorem:
a² + b² = c²
"a" is one side of the right triangle.
Its length is: radius of larger circle minus radius of smaller circle: (11 - 3 = 8)
The distance between the center of the circles creates the hypotenuse (17)
8² + b² = 17²
b² = 225
b = 15
Answer: the length of the common external tangent is 15.
I'm pretty sure it is 155
Answer:
143
Step-by-step explanation:
90-53=37
180-37=143
