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t²= 25² - (50-35)²
t²= 625 - 225
t²= 400
t =√400
t = 20cm
k trapesium : 50+35+25+20 = 130 cm
k½ lingkaran : 3.14 × 20 ×½ = 31.4
• k trapesium - k ½ lingkaran
= 130 cm - 31.4 cm
= 98.6 cm
jadi jawabannya 98.6 cm (a)