Trapezoid
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A trapezoid. 8D
A pyramid has 4 straIGHT SIDES
4 sides and 1 diagonal is given. 3 sides and 2 diagonals are given. 3 angles and measurement of two adjacent angles are given. 3 sides and 2 included angles are given. 4 sides and 1 angle is given.
diagonal can only be found if two sides are known, imagine if you only have one known side ,the other side could be of any length and therefore the diagonal could be any length. if two sides are known then use pythagoras, as the two sides make up the 'adjacent' and 'opposite' side of a right angled triangle e.g. side a=2, side b=4 side c is square root of 2x2 plus 4x4 i.e root of 4+ 16=20 which is approx 4.47
trapezium