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Verified answer
T² = 25² - (50 - 35)²t² = 25² - 15²
t² = 625 - 225
t² = 400
t = √400
t = 20 cm
tinggi trapesium = diameter lingkaran
maka diameter lingkaran = 20 cm
sehingga jari-jari lingkaran = 1/2 d = 1/2 (20 cm) = 10 cm
Keliling 1/2 lingkaran
= 1/2 (2 x π x r)
= π x r
= 3,14 x 10 cm
= 31,4 cm
Keliling daerah yang diarsir
= 31,4 cm + 50 cm + 25 cm + 35 cm
= 141,4 cm
Jawabannya D