tlg dijawab dong kk/abg secepatnya..

a. (1) L = 1/4 x π x r²
= 1/4 x 22/7 x 14cm x 14 cm
= 1/2 x 11 x 2 cm x 14 cm
= 22 cm x 7 cm
= 154 cm²
(2) L = s x s
= 14cm x 14 cm
= 196 cm²
L yg diarsir = L2-L1
= 196cm²-154cm²
= 45cm²
b. (1) L = 1/4 x π x r²
= 1/4 x 22/7 x 28cm x 28cm
= 22 x 4cm x 7 cm
= 616cm²
(2) L = s x s
= 28cm x 28cm
= 784cm²
L yg diarsir
= L2-L1
= 784cm²-616cm²
= 168 cm²