Heath ID: I.cn.2

G.40

If equals be added to equals, the wholes are equal.

Required for

G.42, G.43, G.45, G.46, G.47, G.48, G.49, G.50, G.51, G.52, G.53, G.54, G.55, G.56, G.57, G.58, G.59, G.60, G.61