Penjelasan dengan langkah-langkah:

1. a. 4/5 sudut siku-siku = 4/5 × 90° = 72° (sudut lancip)

b. 8/12 sudut lurus = 8/12 × 180° = 1.440/12 = 120° (sudut tumpul)

c. 2/6 putaran penuh = 2/6 × 360° = 720/6 = 120° (sudut tumpul)

d. 1 1/9 sudut lurus = 10/9 × 180° = 1.800/9 = 200° (sudut refleks)

2. a. 180° = 180°/90° = 2 sudut siku-siku

180° = 180°/180° = 1 sudut lurus

180° = 180°/360° = ½ putaran

b. 360° = 360°/90° = 4 sudut siku-siku

360° = 360°/180° = 2 sudut lurus

360° = 360°/360° = 1 putaran

c. 830° = 830°/90° = 9 2/9 sudut siku-siku

830° = 830°/180° = 4 11/18 sudut lurus

830° = 830°/360° = 2 11/36 putaran