panjang busur CD= 32 cm. hitunglah: a. panjang busur ab b. panjang busur ad c. keliling lingkaran

a. busur ab / busur cd = <ab /<cd
ab / 32 = 50/80
32 . 50 = ab . 80
1600 = ab . 80
ab = 1600 / 80
=20
b. busur ad / busur cd = <ab /<cd
ad / 32 = 140/80
32 . 140 = ab . 80
4480 = ab . 80
ab = 4480 / 80
=56