Mathematics for IGCSE & O level - Similarity (Section 2 - No. 2)
Two triangles ABC and BDC, where angle ABC = angle BDC = 90° and AB=6cm, BC=8cm, and BD=4.8cm. What is the length of DC?
3.6 cm
6.4 cm
10 cm
5.2 cm
คำอธิบาย
Since the scale factor is 4.8/6=0.8. Hence, DC = 8 x 0.8 = 6.4 cm