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It is a right angle triangle because it complies with Pythagoras' theorem. Area = 1/2*30*40 = 600 square cm
50 cm2
1500/30 = 50 cm in length
40 cm * 40 cm = 1600 cm2
It is an area - something takes up a space that is 50 centimetres in length and 40 centimetres in width. (It is a rectangular space).