An umbrella is made by stitching 12 triangular pieces of cloth each measuring 50cm by 20cm by 50cm.find the area of the cloth used in it.(take √6=2.45)
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the area of 1 triangle =b/4√(4a²-b²)
where a is equal sides and b is the third side
20/4√(4×50²-20²)
5√(4×2500-400)
5√(10000-400)
5√9600
5×10√96
50×4√6
200×2.45
490
so the area of the 12 triangle=490×12
5880
where a is equal sides and b is the third side
20/4√(4×50²-20²)
5√(4×2500-400)
5√(10000-400)
5√9600
5×10√96
50×4√6
200×2.45
490
so the area of the 12 triangle=490×12
5880
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