tolong dijawab ya pakai cara plisss soalnya dikumpulin besok

16.)
x = 30 × 20 / 60 =600 / 60 =10cm^2

17.)
alfa = 62,8 × 360 / (3,14 × 10^2)
alfa = 628 × 360 /(3140)
alfa = 72derajat ( B )

18.)
l = √ 13^2 - (8 - 3)^2
l = √13^2 - 5^2
l = √169 - 25
l = √144
l = 12cm ( B )

19.)
d = √25^2 - (5 + 2)^2
d = √625 - 7^2
d = √576
d = 24cm ( D )

#semoga membantu...