Yes, 0.4 and 0.40 are equal. Both numbers represent the same value, which is four tenths. The additional zero at the end of 0.40 does not change the value of the number, as it is insignificant in terms of the decimal representation.
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equal angles are angles that are equal
22 is equal to 16 if 7 is equal to 13.
A square has 4 equal sides with opposite angles that are equal.
A Rhombus has four equal sides but not (necessarily) four equal angles.
A rhombus is shaped like a diamond. It has equal sides but it does not have all equal angles. However the opposite angles are equal .