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2. a.l =1/4 ×22/7 × 3,5 = 2,75 cm2
k= 1/4×22/7×7 =11 cm
b.l = 1/2 ×22/7×35/10×35/10+70
77/4 + 70 = 89,2 cm2
k= 5,5 + 34 = 39,5 cm