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i really really need help o this

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Sagot :

Answer:

20.1

Step-by-step explanation:

take the base. a right triangle is formed with 12 and 8 sides

the hypotenuse = 14.42 which will be the base to right triangle former by ht 14 cm

now the hypotenuse is the diagonal

14.42^2+14^2 = 403.9

diagonal=20.1