carilah luas daerahnya (yang di arsir)

1. L persegi - L 1/4 lingkaran
= (35 x 35) - (1/4 x 1/2 x 22/7 x 35 x 35)
= 1225 - (1/8 x 22 x 5 x 35)
= 1225 - 481,25
= 743,75

2. L persegi - L lingkaran
= (20 x 20) - (1/2 x 3,14 x 10 x 10)
= 400 - (3,14 x 50)
= 400 - 157
= 243

3. L persegi + 2 L lingkaran
= (21 x 21) + (2 x 1/2 x 22/7 x 10,5 x 10,5)
= 441 + (22 x 1,5 x 10,5)
= 441 + 346,5
= 787,5

4. L layang2 - L lingkaran
= (16 x 24 : 2) - (1/2 x 3.14 x 5 x 5)
= 192 - 39,25
= 152,75