The length of the radius, r is 12 units
Circle Geometry
In order to determine the measure of "r", we will use the Pythagoras theorem as shown:
(25+r)² = r² + 35²
Expand the equation
625 + 50r + r² = r² + 1225
625 + 50r = 1225
50r = 1225 - 625
50r = 600
r = 12
Hence the length of the radius, r is 12 units
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