dwisekar45
No 43 L arsir = 1/2 x 10 x 10 x 3,14 + (20 x 10 - 1/2 x 10 x 10 x 3,14) = 157 + 43 = 200 cm2
nomer 44 BC = √12²+5² = √144+25 = √169 = 13 cm
L arsir = 1/2 x 6 x 6 x 3,14 + 1/2 x 2,5 x 2,5 x 3,14 - (1/2 x 1/4 x 13 x 13 x 3,14 - 1/2 x 12 x 5) = 56,52 + 9,8125 - (66,3325 - 30) = 66.3325 - 66.3325 + 30 = 30 cm2
L arsir = 1/2 x 10 x 10 x 3,14 + (20 x 10 - 1/2 x 10 x 10 x 3,14)
= 157 + 43
= 200 cm2
nomer 44
BC = √12²+5² = √144+25 = √169 = 13 cm
L arsir = 1/2 x 6 x 6 x 3,14 + 1/2 x 2,5 x 2,5 x 3,14 - (1/2 x 1/4 x 13 x 13 x 3,14 - 1/2 x 12 x 5)
= 56,52 + 9,8125 - (66,3325 - 30)
= 66.3325 - 66.3325 + 30
= 30 cm2