Penjelasan dengan langkah-langkah:

2) m<ABC = [m<AOB]/2

m<ABC = 112°/2

m<ABC =56°

3) Lj OPQ = 108°/360° x 22/7 x 7²

Lj OPQ = 3/10 x 154

Lj OPQ = 462/10

Lj OPQ = 46,2 cm²

4) busur PR = 120°/360° x 22/7 x 2 x 21

busur PR = ⅓ x 22/7 x 42

busur PR = 22 x 42/21

busur PR = 44 cm

5) Luas tembereng = 3,14 x 12²/4 - 12²/2

= 3,14 x 36 - 144/2

= (125,6 - 12,56) - 72

= 125,6 - 84,56

= 41,04 cm²

6) OQ = √(12² + 16²)

OQ = √(144 + 256)

OQ = √400

OQ = 20 cm

7) Luas tembereng = 3,14 x 21²/4 - 21²/2

= 3,14 x 441/4 - 441/2

= 346,185 - 220,5

= 125,685 cm²

8) m<BCD = m<BAD = 88°

9) pgsd = √(10² - (5+3)²)

pgsd = √(100 - 64)

pgsd = √36

pgsd = 6 cm

10) pgsl = √(17² - (10-2)²)

pgsl = √(289 - 64)

pgsl = √225

pgsl = 15 cm