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Sagot :

Bonjour,

a)

40² = 24² + EB²

40² - 24² = EB²

1 600 -576 = 416

EB = √416 =>20,4 cm

b)

AE = DC-20,4 = 50-20,4 =>29,6cm

c)

AD = BC, car ABCD est un rectangle

d)

ED² = AE² + AD²

ED² =29,6² + 24²

ED² = 876,16 + 576 =1 452,16

ED = √1 452,16 =>38,11 cm

e)

aire DEC:

(50 * 24)/2 => 600cm²

aire ABCD:

50 * 24 =>1 200 cm²

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