tolong bantu ya plisssss

nomor 2
L lingkaran = π r r
= 22/7 x 28 x 28
= 22 x 4 x 28
= 2464 cm persegi

nomor 3
L layang layang = 1/2 x d1 x d2
= 1/2 x 80 x 65
= 40 x 65
= 2600 cm persegi

nomor 4
L lingkaran = π r r
= 22/7 x 14 x 14
= 22 x 2 x 14
= 616 cm persegi

*semoga membantu. sukses selalu ^_^

2. luas=phi x r²
=22/7 x 28 x 28
=22/7 x 784 cm²
=17.248/7 = c. 2.464
3. ( d¹ x d²) : 2
(80 x 65) : 2 = 5.200 : 2
= d. 2.600
4. r=diameter/2
r=28/2=14
luas=22/7 x 14 cm x 14cm
=22/7 x 196cm²
=4.312/7=d. 616