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7. Eta
1

Sum of Areas of Squares
2

Annulus
3

Angle of 75°
4

Line Equidistant from Three Points
5

Heron's Problem
6

Circumscribed Circle
7

Inscribed Circle
8

Circle Tangent to Three Lines
9

Segment by Midpoint
10

Angle Isosceles
11

Excircle