# The solid lies between planes perpendicular to the

11-gopal patil 2022-10-08

The solid lies between planes perpendicular to the x-axis at
x = -1 and x = 1. The cross-sections perpendicular to the
x-axis between these planes are squares whose bases run from the
semicircle y = - 21 - x2 to the semicircle y = 21 - x2
.

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