△ ABC ~ △DEF. If the areas of △ABC and △DEF are 100 cm2 and 81 cm2, respectively and the altitde of △DEF is 6.3 cm, then the corresponding altitude of △ABC is:
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 7 cm.
If △ ABC ~ △DEF,
△ABC : △DEF = (Altitude of △ABC) : (Altitude of △DEF)
100 : 81 = x2 : (6.3)2
x = 7.