Penjelasan dengan langkah-langkah:
12) 5/9 putaran = 5/9 x 360°
= 5 x 360/9
= 5 x 40
= 200°
13) A = 67°
A + B = 90° → berpenyiku
B = 90° – 67°
B = 27°
14) Pelurus 79° = 180° – 79° = 101°
15) 4x – 5 + x + 20 = 180°
5x + 15 = 180°
x + 3 = 36
x = 36 – 3
x = 33
KNM = 4x – 5
= 4 × 33 – 5
= 132 – 5
= 127°
16) 7x – 35 + 3x +15 = 180°
10x = 180 + 20
x = 200/10
x = 20°
P = 7x – 35
= 7×20 – 35
= 140 – 35
= 105°
17) Pasangan sudut
a. luar berseberangan : sudut P1 dan Q3 , P4 dan Q2
b. dalam berseberangan : sudut P2 dan Q4 , P3 dan Q1
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Penjelasan dengan langkah-langkah:
12) 5/9 putaran = 5/9 x 360°
= 5 x 360/9
= 5 x 40
= 200°
13) A = 67°
A + B = 90° → berpenyiku
B = 90° – 67°
B = 27°
14) Pelurus 79° = 180° – 79° = 101°
15) 4x – 5 + x + 20 = 180°
5x + 15 = 180°
x + 3 = 36
x = 36 – 3
x = 33
KNM = 4x – 5
= 4 × 33 – 5
= 132 – 5
= 127°
16) 7x – 35 + 3x +15 = 180°
10x = 180 + 20
x = 200/10
x = 20°
P = 7x – 35
= 7×20 – 35
= 140 – 35
= 105°
17) Pasangan sudut
a. luar berseberangan : sudut P1 dan Q3 , P4 dan Q2
b. dalam berseberangan : sudut P2 dan Q4 , P3 dan Q1