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Geometry Solution Page 147-3:
We think there is an error in the calculation of line segment AB on this page. We don't see an errata sheet for this.
AB squared = 5 squared + 5 squared
AB = square root of 50
AB = 7.1 cm
The solution page says the square root of 50 = 8.7 cm.
My son noticed that while the length of the edges from the apex to the base are 8.7 cm.
Julia & Liam