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kirill115 [55]
3 years ago
6

Help please and thanks

Mathematics
1 answer:
LUCKY_DIMON [66]3 years ago
3 0

Answer:

The radius = 3 units.

Step-by-step explanation:

Ad and AB are both radii of the circle . Let each = r.

Using the Pythagoras theorem:

(r+2)^2 = r^2 + 4^2

r^2 + 4r + 4 = r^2 + 16

4r + 4 = 16

4r = 12

r = 3.

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