Answer:
Option (C)
Step-by-step explanation:
If AD is the altitude to BC, both the segments AD and BC will be perpendicular to each other.
By the property of perpendicular lines,

where
is the slope of the line AD and
is the slope of BC.



Now from the given property,


Therefore, slope of altitude BC = 
Option (C) will be the answer.
A complement angle mean that make with angle E together 90 degrees
7x-12 + angle complement = 90
angle complement = 90 -(7x-12)
angle complement = 90 -7x +12
angle complement = 102 -7x
so choice b. is right sure
Answer: A)2
Step-by-step explanation:
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Answer:
Therefore the length of each sides of a triangle are 135 cm , 135 cm and 45 cm.
Step-by-step explanation:
Let the two sides of a triangle having same length be 'x' cm
According to given condition the third side will be 
Perimeter of the triangle = 315 cm.
To Find:
what is the length of each side =?
Solution:
Let we name the triangle as ΔABC having sides


We know that very Perimeter of a Triangle is given by the sum of all the sides,

Substituting the values we get

substituting 'x' for the third side we get

Therefore,


Therefore the length of each sides are 135 cm , 135 cm and 45 cm.