Because 40=(4x10) 4x4=16 10x10=100 so 16x100=1600
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XL = 40 40 x 40 = 1600 1600 = MDC
40 cm * 40 cm = 1600 cm2
Half of a rectangle is a right angled triangle. Pythagoras! Hyp squared = 6 squared + 40 squared = 36 + 1600 = 1696 so Hypotenuse = sqrt 1696 = 41.18252
40+40 = 80 and 40*40 = 1600
To find 40 percent of a number, multiply the number by 0.4. In this instance, 0.4 x 1600 = 640. Therefore, 40 percent of 1600 is equal to 640.