Mathematics for IGCSE & O level - Similarity (Section 2 - No. 41)
In the triangle, angle ABC = angle BDC = 90°, AB = 6 cm, BC = 8 cm and BD = 4.8 cm. What is the length of DC?
6 cm
6.4 cm
7 cm
7.2 cm
Explicació
Scale factor = 4.8/6 = 0.8. DC = 8 * 0.8 = 6.4 cm