7. Draw five triangles and measure their sides. Check in each case, if the sum of the lengths of any two sides is always less than the third side.
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the hard protective outer case of a mollusc or crustacean.
"cowrie shells"
Similar:
carapace
outside
exterior
armour
2.
an explosive artillery projectile or bomb.
"the sound of the shell passing over, followed by the explosion"
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