Answer:
81
Step-by-step explanation:
Given the expression:
To make it a perfect square, we follow the following steps.
Divide the coefficient of x by 2
Square It
Add it to the expression
This is written as a perfect square as:
The constant term required therefore is 81.
The light's coverage area is given mathematically as i.e. Area=
Given that a lighthouse casts a revolving beam of light as far as they peir and asked the area is covered.
The revolving beam of light covers the whole space i.e entirely 360°
I.e. it forms a circle-like region
Area of circle = { where r is the radius of circle}
Let's assume the distance traveled by light as "d"
as it forms a circular region, it forms a circle of radius "d"
Mathematical connection i.e. area of the region
⇒area of circular region= {where d is the radius of region}
Learn more about area here:
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