Jawab kan nomor 1&2 Please

ini yang nomor 1 yah ..

2. L.Juring=
sudut pusat/360derajatxL.lingkaran

- L.j= 100/360x3.14x36
10x3.14 = 31.4 cm2
- 31.4 = 25/360x31.4xr2
5/72x3.14 = 3.14/r2
15.2/72 =31.4/r2
15.7xr2 = 31.4x72
r2 = 2260.8/15.7
r = √144
r = 12 cm
- a/360x3.14x90x90=8.478
2.826a /4 = 8.478
2.826a = 8478x4
a = 33.912/2.826
= 12 derajat

maaf klo salah