If it has 2 opposite parallel sides of 10 cm and 2 opposite parallel sides of 5 cm then its perimeter is the sum of the 4 sides which is 30 cm
the opposite of a sum is the difference
The largest possible sum with 2 six sided dice is 12.
A normal die has the numbers 1,2,3,4,5 and 6 on its faces. The numbers are arranged so that those on opposite faces of the die sum to seven. This then means that the number 1,2 and 3 share a vertex. When viewed from above the vertex, these three numbers usually go in a counterclockwise direction. This is a right-handed die. Left-handed dice, where the three numbers are in a clockwise configuration, also exist.
There are 36 permutations of two dice. Of these, 9 have a sum of 5 or 6, so the probability of rolling a sum of 5 or 6 on two dice is 9 in 36, or 1 in 9, or about 0.1111.
25
It is the sum of its sides
They don't HAVE to - it's just the way dice have always been marked. You could have a dice that has 6 & 5, 3 & 4 and 1 & 2 on opposite sides - it would still be a dice but wouldn't follow the 'opposites total 7' rule.
Opposite faces sum to 21.
One out of six... or however many sides your dice have on it.
30
No. Adjacent sides, yes. (Twice the sum)
All opposite sides of a die are meant to add up to 7. So: 1 and 6 2 and 5 3 and 4 This is also part of why the most common dice rolls (involving two dice, in a game of monopoly for example) is 7 -- because every number can match with another number to give a sum of 7.
sum of squares of opposite sides
33,33333...%
Square. Square is a quadrilateral and all sides are equal and opposite sides are parallel, the sum of the interior angle measure 3600.
-- Opposite sides are parallel. -- Opposite sides are equal. -- All four sides are equal. -- Adjacent sides are equal. -- Adjacent angles are supplementary. -- Opposite angles are equal. -- Diagonals are perpendicular. -- Interior angles sum to two straight angles. -- Exterior angles sum to two straight angles.