Answer:
Step-by-step explanation:
We have given that,this net can be folded to make a square pyramid.
we have to find the value of the surface area of this pyramid.
The surface area of this pyramid is the sum of all sides of it.
Atfirst the area of the bottom part,as it is a square,
<u>Area</u><u>=</u><u>side</u><u>^</u><u>2</u>
So,Area of the bottom. part=5^2=25 square inch.
<u>NOW</u><u> </u><u>we</u><u> </u><u>have to</u><u> </u><u>find the value of</u><u> </u><u>the</u><u> </u><u>side</u><u> </u><u>areas</u><u> </u><u>of</u><u> </u><u>this</u><u> </u><u>pyramid</u><u>. </u>
As these parts are a triangle
<u>Area</u><u> </u><u>of</u><u> </u><u>triangle</u><u>=</u><u>1</u><u>/</u><u>2</u><u>×</u><u>bh</u>
where
so,Area=
<em>But</em><em> </em><em>in</em><em> </em><em>this</em><em> </em><em>pyramid</em><em>, </em><em>it</em><em> </em><em>has</em><em> </em><em>4</em><em> </em><em>triangular</em><em> </em><em>sides</em><em>.</em>
So,Area of all triangular side=4×15=60 square inch.
<h3>
HENCE,</h3>
The surface area =60+25=85 square inch