Penjelasan dengan langkah-langkah:

Materi Lingkaran

3)

= 96/360 × 2 × 22/7 × 10,5

= 17,6 cm ( D )

4) Selisih Luas

= ( 3,14 × 25 × 25 ) - (3,14×24×24)

= 1962,5 - 1808,5

= 154 cm² ( A )

note : Hasil dalam pembulatan satuan terdekat

5)

BOC = (180-135)

= 45°

AOC/BOC = AC/BC

135/45 = AC/12

AC = 12×135/45

AC = 36 cm (C)

6)

LO.Abc - L∆Abc

= ( ½ × 3,14 × 5 × 5 ) - ( ½ × 8 × 6 )

= 39,25 - 24

= 15,25 cm²

L = ( ½× 3,14 × 4 × 4 ) + ( ½× 3,14 × 3 × 3)

= 25,12 + 14,13

= 39,25

= 39,25 - 15,25

= 24 cm² ( A )

7)

K = ½lingkaran

K = (πr)

132 = 22/7×π

π = 132 × 7/22

π = 42 cm ( B )