Question
A roof is made by using 20 triangular rocks which are equally divided in 4 different colours.The sides of each piece are 2 m, 5 m and 5 m. What is the area covered by each colour?
Answer: Option B
:
B
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B
S=Perimeter2 =(2+5+5)2=6 m
Area of the triangle= √s(s−a)(s−b)(s−c)
=√6(6−2)(6−5)(6−5)
=√6×4×1×1
=2√6 m2
Since there are 20 rocks of 4 colours, number of rocks of each colour =204=5
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Therefore the area covered by each type of rock will be =2√6×5 =10√6 m2
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