Répondre :
bonjour
selon le th de Pythagore
CE² = BE² - CB²
CE² = 13² - 5 ²
CE² = 169 - 25 = 144
CE = √ 144 = 12 cm
( 12 x 5 ) / 2 = 60/2 = 30
aire triangle = 30 cm²
R' = 30 + ( 12 x 5 ) = 30 + 60 = 90 m²
bonjour
selon le th de Pythagore
CE² = BE² - CB²
CE² = 13² - 5 ²
CE² = 169 - 25 = 144
CE = √ 144 = 12 cm
( 12 x 5 ) / 2 = 60/2 = 30
aire triangle = 30 cm²
R' = 30 + ( 12 x 5 ) = 30 + 60 = 90 m²