Line DE is parallel to side BC of triangle ABC. If AD = 5 cm, DB = 10 cm, and the area of triangle ABC is 90 sq cm, find the area of triangle ADE (in sq cm).
Class 10Basic Proportionality TheoremGeometry — Similarity
A10
B20
C11
D9
Step-by-Step Solution
ABAD=155=31.Area ABCArea ADE=(31)2=91, so area ADE = 990=10 sq cm.
Answer: A) 10
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