Here we need to solve some expressions. Remember the following rules:
Then, from the left side:
from the right side:
Answer:
Breadth = 15 cm
Step-by-step explanation:
Area = length x breadth
315 = 21 x breadth
[ dividing both sides by 21 ]
7
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Answer: C, E, F
parallel when a=2
perpendicular when a=-1/2