tolong bantu jawab pakai rumusnya

Nomor 7]

r = √[L/π]
r = √[64π/π]
r = √64
r = 8 cm


Nomor 8]
Luas Arsiran
= L. Persegi - L ¼ Lingkaran
= (14 x 14) - (¼ x 22/7 x 14²)
= 196 - (22/28 x 196)
= 196 - 154
= 42 cm²