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5x° = 90°
x° = 18
<DAC = 3x°
= 3(18)°
= 54°
29. Panjang busur = 90°\360° ×2 × phi × r
= 1/4 × 2 × 22/7 × 28
= 44 cm
30. d² — (r1 - r2) ²= 20² - 12²
400 — 144
25= -16²