RD.2†

RD.2.1

RD.2.2

RD.2.3

RD.2.4

RD.2.5

RD.2.6

A

226

226

226

226

226

226

B

102

102

102

102

102

102

C

65

65

65

65

65

65

D

172

190

199

208

215

221

Ideal Outer Radius

450

675

900

1350

2250

5400

No. of bricks in quadrant

3

6

9

15

36

† Back face may be flat or concave

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