Question

Big point harus pakai cara ya 2-3

Answer 1

Luas 1/2 lingkaran = 1/2 πr²
88 = 1/2 3,14 r²
r² = 88x2/3,14
r² = 56
r = 7,48cm
D = 15cm

K = 2 x 3,14 x r
128,4 = 6,28
r = 20,4cm

Luas = 3,14 x 20,4² = 1306,74cm²

Answer 2

2) 1/2 x 22/7 x r^2 = 88
r^2 = 88 x 7 : 11 = 56
r = √56=2√14
diameter = 4√14
3) 3,14 x 2 x r = 128,4
r = 128,4 : 6,28
r = 20,4
luas lingkaran = 3,14 x 20,4 x 20,4
luas lingkaran = 1306,74